Document:

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                                                                   EXHIBIT 10.1c

                               SECOND AMENDMENT TO
                           LOAN AND SECURITY AGREEMENT

This Amendment is made effective as of the 16th day of April, 2001, by and
between HEI, Inc., a Minnesota corporation (the "Borrower"), and LaSalle
Business Credit, Inc., a Delaware corporation (the "Lender").

                                    Recitals

The Borrower and the Lender have entered into that certain Loan and Security
Agreement dated as of July 31, 2000, as amended by that certain First Amendment
to Credit Agreement dated August 31, 2000 (collectively, the "Loan Agreement").

The Borrower may request certain advances from the Lender from time to time
pursuant to the Loan Agreement, and the Lender has agreed to make capital
expenditure loans, to make term loans, and to make available letters of credit,
to or for the benefit of the Borrower pursuant to the terms of the Loan
Agreement.

The revolving loan advances under the Loan Agreement are evidenced by the
Borrower's revolving note dated July 31, 2000, in the maximum principal amount
of $5,000,000 and payable to the order of the Lender (the "Revolving Note"). The
capital expenditure loans made under the Loan Agreement to date are evidenced by
the Borrower's capital expenditure note dated July 31, 2000, in the original
principal amount of $1,665,000, and by the Borrower's capital expenditure note
dated February 16, 2001, in the original principal amount of $635,000
(collectively, the "Capex Note").

All indebtedness of the Borrower to the Lender is secured pursuant to the terms
of the Loan Agreement and all Other Agreements as defined therein (collectively,
the "Security Documents").

NOW, THEREFORE, in consideration of the premises and of the mutual covenants and
agreements herein contained, it is agreed as follows:

1. Terms used in this Amendment which are defined in the Loan Agreement shall
have the same meanings as defined therein, unless otherwise defined herein.

2. The Loan Agreement is hereby amended as follows:

     (a)  Paragraph (xv) under the definition of "ELIGIBLE ACCOUNTS" in Section
          1 of the Loan Agreement is hereby amended by deleting said Section in
          its entirety and replacing the same with the following:

          "(xv) it is not an Account which, when added to a particular Account
               Debtor's other indebtedness to Borrower, exceeds the lesser of
               ten percent (10%) of the aggregate of Borrower's Accounts or a

<PAGE>

               credit limit determined by LaSalle in its reasonable credit
               judgment for that Account Debtor, provided, however, that the 10%
               credit limit set forth herein shall instead be (A) 20% for
               Accounts owed by Agere Systems, Inc., formerly known as Lucent
               Technologies, Inc., (B) 15% for Accounts owed by AMP, Inc., (C)
               50% for Accounts owed by Siemens Medical Instruments, through the
               date which is one (1) year after the Closing Date, and 40%
               thereafter, and (D) the greater of 25% or the amount of credit
               insurance obtained for Accounts owed by Sonic Innovations which
               are paid within sixty (60) days after the applicable stated
               invoice date; provided, further, that Accounts excluded from
               Eligible Accounts solely by reason of this paragraph 1(a)(xv)
               shall be Eligible Accounts to the extent of the applicable credit
               limit;"

     (b)  Section 5(a) of the Loan Agreement is hereby amended by deleting the
          second sentence of that Section in its entirety and replacing the same
          with the following: "At Borrower's election, except as otherwise
          provided in paragraph 6 (c) hereof, interest shall accrue on: (A) the
          unpaid principal balance of the Capex Loan made to Borrower
          outstanding at the end of each day at (x) a fluctuating rate per annum
          equal to one and one-fourth of one percent (1.25%) above the Prime
          Rate or (y) a fixed rate per annum equal to three and three-fourths
          percent (3.75%) above the LIBOR Rate; and (B) the principal amount of
          the Revolving Loans made to Borrower outstanding at the end of each
          day at (x) a fluctuating rate per annum equal to one percent (1.00%)
          above the Prime Rate or (y) a fixed rate per annum equal to three and
          one-half percent (3.50%) above the LIBOR Rate."

     (c)  Section 5(d) of the Loan Agreement is hereby amended by deleting said
          Section in its entirety and replacing the same with the following:

          "(d)Letter of Credit Fees. Borrower shall remit to LaSalle a letter of
               credit fee equal to two and one-fourth percent (2.25%) per annum
               on the aggregate undrawn face amount of the Victoria Letter of
               Credit, which fee shall be payable monthly in arrears on each day
               that interest is payable hereunder."

     (d)  Section 14(n)(i) of the Loan Agreement is hereby amended by deleting
          said Section in its entirety and replacing the same with the
          following:

          "(i)Tangible Net Worth. Borrower shall maintain, on an aggregate basis
               with all Affiliates of Borrower, as of the end of (A) the fiscal
               quarter ending June 2, 2001, a Tangible Net Worth of not less
               than nine million five hundred thousand dollars ($9,500,000); (B)
               the fiscal year ending August 31, 2001, a Tangible Net Worth of
               not less than ten million dollars ($10,000,000), (C) each fiscal
               quarter thereafter, a Tangible Net Worth of not less than ninety
               percent (90%) of the actual Tangible Net Worth for the most
               recently ended fiscal year, and (D) the fiscal year ending August
               31, 2002 and each fiscal year end thereafter, a Tangible Net
               Worth of not less than one million dollars ($1,000,000) in excess
               of the actual Tangible Net Worth as of the previous fiscal year
               end;"

                                      -2-

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     (e)  Section 14(n)(ii) of the Loan Agreement is hereby amended by deleting
          said Section in its entirety and replacing the same with the
          following:

          "(ii) Interest Coverage Ratio. Borrower shall maintain, on an
               aggregate basis with all Affiliates of Borrower, as of the end of
               each fiscal quarter, commencing with the fiscal quarter ending
               August 31, 2001, a ratio of (A) net income, plus interest, taxes,
               depreciation and amortization, less unfinanced Capital
               Expenditures, on a year-to-date basis through such fiscal quarter
               to (B) year-to-date interest expense through such fiscal quarter,
               of not less than 1.50 to 1.00;"

     (f)  Section 14(n)(iii) of the Loan Agreement is hereby amended by deleting
          said Section in its entirety and replacing the same with the
          following:

          "(iii) Debt Service Coverage Ratio. Borrower shall maintain, on an
               aggregate basis with all Affiliates of Borrower, a Debt Service
               Coverage Ratio, as of the end of each fiscal quarter, commencing
               with the fiscal quarter ending December 1, 2001, of not less than
               1.25 to 1.00, provided however, that for the fiscal quarter
               ending August 31, 2001, such ratio shall be not less than 0.90 to
               1.00; and"

     (g)  Section 14(n)(iv) of the Loan Agreement is hereby amended by deleting
          said Section in its entirety and replacing the same with the
          following:

          "(iv) Year to Date Net Loss. The Borrower shall have a net loss,
               measured on a fiscal year to date basis, of not more than (A)
               $1,250,000 as of June 2, 2001, and (B) $1,000,000 as of August
               31, 2001."

3. Lender consents to Borrower's request to incur subscription notes receivable
of up to $2,700,000 in connection with the exercise of stock options by various
officers and directors of the company, which action, absent such consent by
Lender, would constitute a violation of Section 14(j), Section 14(l), and
Section 14(p) of the Loan Agreement. Lender's consent is conditioned upon said
notes being personally guaranteed by each debtor, and being payable over five
years, with interest payable on the notes quarterly at the rate of 0.25% in
excess of the Prime Rate; provided however, that each such note shall be
reviewed by Lender's legal counsel and approved as containing terms acceptable
to Lender.

4. Borrower will make a one time $200,000 prepayment on the Capex Loan to be
applied against outstanding principal on the Capex Note dated July 31, 2000, in
the original principal amount of $1,665,000.

5. The Borrower's (a) violation of Section 14(n)(i) by failing to maintain at
least the minimum required Tangible Net Worth; (b) violation of Section
14(n)(ii) by failing to maintain at least the minimum required Interest Coverage
Ratio; and (c) violation of Section 14(n)(iii) by failing to maintain at least
the minimum required Debt Service Coverage Ratio, in each case as of the
Borrower's fiscal quarter ending March 3, 2001, each independently constitutes

                                      -3-

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an Event of Default under the Loan Agreement. Lender hereby waives these three
specific Events of Default by the Borrower arising due to Borrower's violations
of the Tangible Net Worth covenant, the Interest Coverage Ratio covenant and the
Debt Service Coverage Ratio covenant, as described herein. Except as expressly
set forth above in this paragraph, and subject to the limitations set forth
herein, Lender is not waiving any other covenant, violation, or breach of the
Loan Agreement which may exist as of the date hereof or any other event,
circumstance or condition which with the giving of notice or the passage of
time, or both, would constitute a violation or breach of the Loan Agreement.
Lender specifically reserves the right to exercise any and all rights and
remedies available to it under the Credit and Security Agreement and the
documents related thereto in the event of a Default or an Event of Default at
any time in the future. Without limiting the foregoing, Lender expects that the
Borrower will maintain compliance with all its covenants under and relating to
the Loan Agreement, including the covenant regarding Tangible Net Worth, the
covenant regarding Interest Coverage Ratio and the covenant regarding Debt
Service Coverage Ratio, and Lender will closely monitor the same in the future
to ascertain such continued compliance. The failure or forbearance by Lender to
exercise any of its rights or remedies at any time shall not constitute a waiver
of any such rights or remedies. The waiver set forth in this letter is limited
to the specific waiver set forth herein, and should not be construed as an
express or implied agreement of Lender to waive any future violations of any
covenant or obligation of the Borrower under the Loan Agreement or any documents
related thereto.

6. Except as explicitly amended by this Amendment, all of the terms and
conditions of the Loan Agreement shall remain in full force and effect and shall
apply to any advance thereunder.

7. This Amendment shall be effective as of April 16, 2001, upon receipt by the
Lender of (i) an executed original hereof, together with the acknowledgement and
agreement of guarantor set forth at the end of this Amendment, executed by the
Corporate Guarantor, and (ii) a fully-earned, non-refundable amendment fee in
the amount of $25,000.

8. The Borrower hereby represents and warrants to the Lender as follows:

     (a)  The Borrower has requisite power and authority to execute this
          Amendment and to perform all of its obligations hereunder, and this
          Amendment has been duly executed and delivered by the Borrower and
          constitutes the legal, valid and binding obligation of the Borrower,
          enforceable in accordance with its terms.

     (b)  The execution, delivery and performance by the Borrower of this
          Amendment have been duly authorized by all necessary corporate action
          and do not (i) require any authorization, consent or approval by any
          governmental department, commission, board, bureau, agency or
          instrumentality, domestic or foreign, (ii) violate any provision of
          any law, rule or regulation or of any order, writ, injunction or
          decree presently in effect, having applicability to the Borrower, or
          the articles of incorporation or by-laws of the Borrower, or (iii)
          result in a breach of or constitute a default under any indenture or
          loan or Loan Agreement or any other agreement, lease or instrument to
          which the Borrower is a party or by which it or its properties may be
          bound or affected.

                                      -4-

<PAGE>

     (c)  All of the representations and warranties contained in Article V of
          the Loan Agreement are correct on and as of the date hereof as though
          made on and as of such date, except to the extent that such
          representations and warranties relate solely to an earlier date.

9. All references in the Loan Agreement to "this Agreement" shall be deemed to
refer to the Loan Agreement as amended hereby; and any and all references in the
Security Documents to the Loan Agreement shall be deemed to refer to the Loan
Agreement as amended hereby.

10. Except as expressly detailed in Section 5 herein, the execution of this
Amendment and any documents related hereto shall not be deemed to be a waiver of
any other Default or Event of Default under the Loan Agreement or other breach,
default or event of default under any Security Document or other document held
by the Lender, whether or not known to the Lender and whether or not existing on
the date of this Amendment.

11. The Borrower hereby absolutely and unconditionally releases and forever
discharges the Lender, and any and all participants, parent corporations,
subsidiary corporations, affiliated corporations, insurers, indemnitors,
successors and assigns thereof, together with all of the present and former
directors, officers, agents and employees of any of the foregoing, from any and
all claims, demands or causes of action of any kind, nature or description,
whether arising in law or equity or upon contract or tort or under any state or
federal law or otherwise, which the Borrower has had, now has or has made claim
to have against any such person for or by reason of any act, omission, matter,
cause or thing whatsoever arising from the beginning of time to and including
the date of this Amendment, whether such claims, demands and causes of action
are matured or unmatured or known or unknown.

12. The Borrower hereby reaffirms its agreement under the Loan Agreement to pay
or reimburse the Lender on demand for all costs and expenses incurred by the
Lender in connection with the Loan Agreement, the Security Documents and all
other documents contemplated thereby, including without limitation all
reasonable fees and disbursements of legal counsel. Without limiting the
generality of the foregoing, the Borrower specifically agrees to pay all fees
and disbursements of counsel to the Lender, for the services performed by such
counsel in connection with the preparation of this Amendment and the documents
and instruments incidental hereto. The Borrower hereby agrees that the Lender
may, at any time or from time to time in its sole discretion and without further
authorization by the Borrower, make a loan to the Borrower under the Loan
Agreement, or apply the proceeds of any loan, for the purpose of paying any such
fees, disbursements, costs and expenses and the fee required under paragraph 6
hereof.

13. This Amendment may be executed in any number of counterparts, each of which
when so executed and delivered shall be deemed an original and all of which
counterparts, taken together, shall constitute one and the same instrument.

              [THE REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK.
                    SIGNATURES APPEAR ON THE FOLLOWING PAGE.]

                                      -5-

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IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly
executed effective as of the day and year first above written.

                                       HEI, INC.

                                       By: _____________________________________

                                           Its: ________________________________

                                       LASALLE BUSINESS CREDIT, INC.

                                       By: _____________________________________

                                           Its: ________________________________

                                      -6-

<PAGE>

                    ACKNOWLEDGMENT AND AGREEMENT OF GUARANTOR

     The undersigned, a guarantor of the indebtedness of HEI, Inc. (the
"Borrower") to LaSalle Business Credit, Inc. (the "Lender") pursuant to a
Continuing Unconditional Guaranty dated as of July 31, 2000 (the "Guaranty"),
hereby (i) acknowledges receipt of the foregoing Amendment; (ii) consents to the
terms (including without limitation the release set forth in paragraph 8 of the
Amendment) and execution thereof; (iii) reaffirms its obligations to the Lender
pursuant to the terms of the Guaranty; and (iv) acknowledges that the Lender may
amend, restate, extend, renew or otherwise modify the Loan Agreement and any
indebtedness or agreement of the Borrower, or enter into any agreement or extend
additional or other credit accommodations, with such notice to or consent of the
undersigned as may be expressly required pursuant to the terms of the Guaranty
for all of the Borrower's present and future indebtedness to the Lender.

                                       CROSS TECHNOLOGY, INC.

                                       By:______________________________________

                                          Its: _________________________________

                                      -7-<PAGE>

                                                                   EXHIBIT 10.1d

                               THIRD AMENDMENT TO
                           LOAN AND SECURITY AGREEMENT

This Amendment is made effective as of the 31st day of October, 2001, by and
among HEI, Inc., a Minnesota corporation ("HEI"), Cross Technology, Inc., a
Minnesota corporation ("Cross" and, together with HEI, the "Borrower"), and
LaSalle Business Credit, Inc., a Delaware corporation (the "Lender").

                                    Recitals

HEI and the Lender have entered into that certain Loan and Security Agreement
dated as of July 31, 2000, as amended by that certain First Amendment to Credit
Agreement dated August 31, 2000 and by that certain Second Amendment to Loan and
Security Agreement dated as of April 16, 2001 (collectively, the "Loan
Agreement").

HEI may request certain advances from the Lender from time to time pursuant to
the Loan Agreement, and the Lender has agreed to make capital expenditure loans,
to make term loans, and to make available letters of credit, to or for the
benefit of HEI pursuant to the terms of the Loan Agreement.

The revolving loan advances under the Loan Agreement are evidenced by HEI's
revolving note dated July 31, 2000, in the maximum principal amount of
$5,000,000 and payable to the order of the Lender (the "Revolving Note"). The
original Revolving Note will be returned to HEI upon the effectiveness of this
Amendment, and will be replaced by the Borrower's amended and restated revolving
note dated of even date herewith in the maximum original principal amount of
$5,000,000. The capital expenditure loans made under the Loan Agreement to date
are evidenced by HEI's capital expenditure notes dated July 31, 2000, February
16, 2001, May 3, 2001 and May 30, 2001, in the respective original principal
amounts of $1,665,000, $635,000, $450,000 and $706,000 (collectively, the "Capex
Note"). Each original Capex Note will be returned to HEI upon the effectiveness
of this Amendment, and will be replaced by the Borrower's amended and restated
capital expenditure notes dated of even date herewith in the respective original
principal amounts of $1,076,500.00, $560,916.69, $412,500.00 and $658,933.32.

Cross previously guaranteed all loans, advances and financial accommodations
made to HEI by the Lender pursuant to that certain Continuing Unconditional
Guaranty of Cross Technology, Inc. dated July 31, 2000 in favor of the Lender
(the "Guaranty"). Upon the effectiveness of this Amendment, Cross will become a
co-borrower under the Loan Agreement and the Other Agreements, the Guaranty will
be terminated, and the original Guaranty will be returned to Cross.

All indebtedness of HEI to the Lender is secured pursuant to the terms of the
Loan Agreement and all Other Agreements as defined therein.

<PAGE>

NOW, THEREFORE, in consideration of the premises and of the mutual covenants and
agreements herein contained, it is agreed as follows:

1. Terms used in this Amendment which are defined in the Loan Agreement shall
have the same meanings as defined therein, unless otherwise defined herein. The
Loan Agreement, and all Other Agreements, are each hereby amended to include
both HEI and Cross, jointly and severally liable as "Borrower" for all
Liabilities and other duties and obligations thereunder. Cross hereby agrees
that, from and after the date hereof, it shall be deemed a "Borrower" for all
purposes under the Loan Agreement and all Other Agreements, including without
limitation, the Notes.

2. The Loan Agreement is hereby further amended as follows:

     (a)  The definition of "DEBT SERVICE COVERAGE RATIO" in Section 1 of the
          Loan Agreement is hereby amended by deleting said definition in its
          entirety and replacing the same with the following:

          "DEBT SERVICE COVERAGE RATIO" shall mean, with respect to any period,
          and on an aggregate basis including the Borrower and all Affiliates of
          the Borrower, the ratio of (i) net income after taxes for such period
          (excluding any after tax gains or losses on the sale of assets (other
          than the sale of inventory in the ordinary course of business) and
          excluding other after-tax extraordinary gains or losses), plus
          deferred taxes, plus depreciation and amortization deducted in
          determining net income for such period, minus Capital Expenditures for
          such period not financed, minus any cash dividends paid or accrued and
          cash withdrawals paid or accrued to shareholders or other Affiliates
          for such period which were not calculated in determining net income
          after taxes, and plus the after-tax increase in all LIFO reserves or
          minus the after-tax decrease in LIFO reserves, to (ii) current
          principal maturity of long term debt and capitalized leases paid or
          scheduled to be paid during such period, plus any prepayments on
          indebtedness owed to any person (except trade payables and revolving
          loans) and paid during such period; provided, however, that during the
          Borrower's fiscal year ending August 31, 2002, only Capital
          Expenditures in excess of $2,500,000 in the aggregate shall be
          deducted as Capital Expenditures in the foregoing formula.

     (b)  Section 1 of the Loan Agreement is hereby amended by adding the
          following new definitions to said Section:

          "LIBOR RATE M&E LOAN" shall mean an M&E Loan that bears interest based
          on the LIBOR Rate.

          "M&E LOAN" shall have the meaning specified in paragraph 3.B. hereof.

          "M&E NOTE" shall mean, collectively, or individually, as the context
          requires, the M&E Notes in the maximum aggregate original principal
          amount of $3,500,000, which may be executed by Borrower to the order
          of LaSalle from time to time in accordance with paragraph 3.B. hereof,
          in the form attached hereto as Exhibit E.

                                      -2-

<PAGE>

          "PRIME RATE M&E LOAN" shall mean an M&E Loan that bears interest based
          on the Prime Rate.

     (c)  Section 1 of the Loan Agreement is hereby further amended by deleting
          the definitions of "Kind", "Loan" or "Loans", "Note", "LIBOR Rate
          Loan", "Prime Rate Loan", "Total Credit Facility" and "Type" from said
          Section and replacing the same with the following:

          "KIND" shall mean, with respect to any Loan, whether such loan is a
          Revolving Loan, a Capex Loan, a Term Loan or a M&E Loan.

          "LIBOR RATE LOAN" shall mean a Revolving Loan, a portion of the Capex
          Loan or a portion of the M&E Loan that bears interest on the LIBOR
          Rate.

          "LOAN" or "LOANS" shall mean any and all Revolving Loans, Capex Loans,
          Term Loans and M&E Loans made by LaSalle to Borrower pursuant to
          paragraphs 2., 3., 3.A. and 3.B. hereof and all other loans, advances
          and financial accommodations made by LaSalle to or on behalf of
          Borrower hereunder.

          "NOTE" shall mean the Revolving Note, the Capex Note, the Term Note or
          the M&E Note.

          "PRIME RATE LOAN" shall mean a Revolving Loan, a Term Loan, the
          portion of the Capex Loan or the portion of the M&E Loan that bears
          interest based on the Prime Rate.

          "TOTAL CREDIT FACILITY" shall mean the sum of $17,000,000.

          "TYPE" shall mean, with respect to any (i) Revolving Loan, whether
          such Revolving Loan is a LIBOR Rate Revolving Loan or a Prime Rate
          Revolving Loan, (ii) Capex Loan, whether any portion thereof is a
          LIBOR Rate Capex Loan or a Prime Rate Capex Loan, and (iii) M&E Loan,
          whether any portion thereof is a LIBOR Rate M&E Loan or a Prime Rate
          M&E Loan.

     (d)  Section 3(a) of the Loan Agreement is hereby amended by adding the
          following sentence to the end of said Section: "Notwithstanding
          anything herein to the contrary, from and after October 1, 2001, the
          Borrower shall not request Capex Loan advances, and LaSalle shall have
          no obligation whatsoever to consider requests or to make Capex Loan
          advances unless the Debt Service Coverage Ratio, on a year-to-date
          basis, as of the end of the month immediately preceding any request
          for a Capex Loan advance is equal to or greater than 1.15 to 1.0."

                                      -3-

<PAGE>

     (e)  The Loan Agreement is hereby amended by adding thereto a new Section
          3.B., reading as follows:

          "3.B. M&E LOANS

          LaSalle shall make non-revolving loans and advances (collectively, the
          "M&E Loan") to Borrower as Borrower shall from time to time request in
          an aggregate amount of up to but not exceeding Three Million Five
          Hundred Thousand and 00/100 ($3,500,000.00), in accordance with the
          terms of this paragraph 3.B. Each request for an M&E Loan advance
          shall be made in writing, together with invoices and other
          documentation acceptable to LaSalle evidencing the hard costs of the
          machinery and equipment acquired or to be acquired with the proceeds
          of the requested M&E Loan advance ("New M&E"). Each M&E Loan advance
          shall be in an amount not less than $100,000 (and in increments of
          $1,000 in excess thereof) and shall be limited to no more than the
          lesser of (i) 70% of the hard costs of the New M&E for which such
          advances requested, or (ii) 80% of the orderly liquidation value of
          such New M&E, as determined by LaSalle. Borrower shall execute and
          deliver to LaSalle an M&E Note from time to time when the aggregate
          amount of M&E Loans made but not evidenced by an M&E Note equals or
          exceeds $500,000; provided, however, that not withstanding the
          aggregate amount of M&E Loans made but not evidenced by an M&E Note,
          Borrower shall execute and deliver to LaSalle an M&E Note on each
          August 31 during the term of this Agreement in an amount equal to the
          then outstanding amount of M&E Loans made but not evidenced by an M&E
          Note. Principal payable on account of the M&E Loan shall be payable in
          successive monthly installments (i) payable on the first day of each
          month, the first of which installment shall be due and payable on the
          first day of the month immediately following the date of each M&E
          Note, and (ii) based on an amortization schedule consisting of sixty
          (60) equal and level payments under each M&E Note; provided, however,
          that the entire unpaid principal balance of the M&E Loan shall be due
          and payable upon the expiration of the Original Term of this
          Agreement; and, provided further, that in the event that the Original
          Term of this Agreement is initially or subsequently renewed in
          accordance with paragraph 12. hereof, then Borrower shall continue to
          make such equal and level monthly principal payments under each M&E
          Note, with the final installment equal to the unpaid principal balance
          of the M& E Loan and any other amounts outstanding due and payable
          upon the expiration of the Renewal Term. Notwithstanding anything
          hereinabove to the contrary, the entire unpaid principal balance of
          the M&E Loan, and any accrued and unpaid interest thereon, shall be
          immediately due and payable upon the earlier to occur of (i) the last
          day of the Original Term or the last day of any Renewal Term, if
          either LaSalle or Borrower elects to terminate this Agreement as of
          the end of any such Original or Renewal Term, and (ii) the
          acceleration of the Liabilities pursuant to paragraph 17. of this
          Agreement. Notwithstanding anything herein to the contrary, the
          Borrower shall not request M&E Loan advances, and LaSalle shall have
          no obligation whatsoever to consider requests or to make M&E Loan
          advances unless the Debt Service Coverage Ratio, on a year-to-date
          basis, as of the end of the month immediately preceding any request
          hereunder for an M&E Loan advance is equal to or greater than 1.15 to
          1.0."

                                      -4-

<PAGE>

     (f)  Section 5(a) of the Loan Agreement is hereby amended by deleting said
          Section in its entirety and replacing the same with the following:

          "(a)Rates of Interest. Interest accrued on all loans shall be due on
          the earliest of (i) the first day of each month (for the immediately
          preceding month), computed thru the last calendar day of the preceding
          month, and also, in the case of a LIBOR Rate Loan, in addition to
          monthly, at the end of the Interest Period applicable thereto; (ii)
          the occurrence of an Event of Default in consequence of which LaSalle
          elects to accelerate the maturity and payment of the liabilities; and
          (iii) termination of this Agreement pursuant to paragraph 12. hereof.
          At Borrower's election, except as otherwise provided in paragraph 6.
          hereof, interest shall accrue on: (A) the unpaid principal balance of
          the Capex Loan made to Borrower outstanding at the end of each day at
          (x) a fluctuating rate per annum equal to three-fourths of one percent
          (0.75%) above the Prime Rate or (y) a fixed rate per annum equal to
          three and one-fourth percent (3.25%) above the LIBOR Rate; (B) the
          principal amount of the Revolving Loans made to Borrower outstanding
          at the end of each day at (x) a fluctuating rate per annum equal to
          one-half of one percent (0.50%) above the Prime Rate or (y) a fixed
          rate per annum equal to three percent (3.00%) above the LIBOR Rate;
          (C) the unpaid principal balance of the Term Loan made to the Borrower
          at a fluctuating rate per annum equal to four percent (4.00%) above
          the Prime Rate; and (D) the unpaid principal balance of the M&E Loan
          made to Borrower outstanding at the end of each day at (x) a
          fluctuating rate per annum equal to three-fourths of one percent
          (0.75%) above the Prime Rate or (y) a fixed rate per annum equal to
          three and one-fourth percent (3.25%) above the LIBOR Rate.
          Notwithstanding the foregoing, the interest rates set forth above
          (other than the interest rate set forth in clause (C) above) shall be
          reduced by one-half of one percent (0.50%) on the first day of the
          first calendar month following LaSalle's receipt and satisfactory
          review of Borrower's financial statements for the fiscal year ending
          August 31, 2002 (the "Rate Reduction Date") if such financial
          statements, delivered to LaSalle in accordance with paragraph 11.
          hereof, reflect that the Borrower's consolidated net after-tax income
          for such fiscal year equals or exceeds $750,000. The rate of interest
          payable on Prime Rate Loans shall increase or decrease an amount equal
          to the increase or decrease in the Prime Rate, effective as of the
          opening of business on the day that any such change in the Prime Rate
          occurs. Upon and after the occurrence of an Event of Default, and
          during the continuation thereof, the principal amount of all loans
          shall bear interest on demand at a rate per annum equal to (1) with
          respect to the Capex Loan, the rate of interest then in effect in
          paragraph 5.(a)(A) plus two percent (2.0%), (2) with respect to
          Revolving Loans, the rate of interest then in effect under paragraph
          5.(a)(B) plus two percent (2.0%), (3) with respect to Term Loans, the
          rate of interest then in effect under paragraph 5.(a)(C) plus two
          percent (2.0%), and (4) with respect to the M&E Loan, the rate of
          interest then in effect under paragraph 5.(a)(D) plus two percent
          (2.0%)."

                                      -5-

<PAGE>

     (g)  Section 6(a) of the Loan Agreement is hereby amended by deleting said
          Section in its entirety and replacing the same with the following:

          "(a)Loan Requests. A request for a Revolving Loan, for a Capex Loan,
          for a Term Loan and for an M&E Loan shall be deemed to be made, each
          in the following manner: (i) Borrower shall give LaSalle same day
          notice, no later than 10:30 A.M. (Chicago time) of such day, of its
          intention to borrow a Prime Rate Revolving Loan, a Prime Rate Capex
          Loan, a Term Loan or a Prime Rate M&E Loan, and at least three (3)
          business days prior notice of its intention to borrow a LIBOR Rate
          Revolving Loan, a LIBOR Rate Capex Loan or a LIBOR Rate M&E Loan, in
          which notice Borrower shall specify (in addition to any other
          requirements specified in paragraph 2., paragraph 3., paragraph 3A. or
          paragraph 3B. hereof) the amount of the proposed borrowing and the
          proposed borrowing date; provided, however, that no such request may
          be made at a time when there exists a default or an Event of Default;
          (ii) the coming due of any amount required to be paid under this
          Agreement or any Note, whether on account of interest or for any other
          liability, shall be deemed irrevocably to be a request for a Prime
          Rate Revolving Loan on the due date thereof in the amount required to
          pay such interest or other Liability; and (iii) the occurrence of the
          Term Loan Conditions shall be deemed irrevocably to be a request for a
          Term Loan on the date of such occurrence in the amount of the draw
          under the Victoria Letter of Credit made in connection with such
          occurrence. As an accommodation to Borrower, LaSalle may permit
          telephone requests for Revolving Loans and electronic transmittal of
          instructions, authorizations, agreements or reports to LaSalle by
          Borrower. Unless Borrower specifically directs LaSalle in writing not
          to accept or act upon telephonic or electronic communications from
          Borrower, LaSalle shall have no liability to Borrower for any loss or
          damage suffered by Borrower as a result of LaSalle's honoring of any
          requests, execution of any instructions, authorizations or agreements
          or reliance on any report communicated to it telephonically or
          electronically and purporting to have been sent to LaSalle by Borrower
          and LaSalle shall have no duty to verify the origin of any such
          communication or the authority of the Person sending it. Each notice
          of borrowing shall be irrevocable by and binding on Borrower, and if
          such notice requests the borrowing of a LIBOR Rate Revolving Loan, a
          LIBOR Rate Capex Loan or a LIBOR Rate M&E Loan, such notice shall
          state the Interest Period with respect thereto. Borrower, at its
          option, may choose Prime Rate Revolving Loans, Prime Rate Capex Loans,
          Prime Rate M&E Loans, LIBOR Rate Revolving Loans, LIBOR Rate Capex
          Loans or LIBOR Rate M&E Loans provided, that any LIBOR Rate Loan shall
          be in a minimum amount of $1,000,000 or an integral multiple of
          $250,000 in excess thereof; and provided, further, that the right of
          Borrower to choose any LIBOR Rate Loan is subject to the provisions of
          paragraph 6(c) hereof."

     (h)  Section 6(b) of the Loan Agreement is hereby amended by deleting said
          Section in its entirety and replacing the same with the following:

                                      -6-

<PAGE>

          "(b) Disbursements. Borrower hereby irrevocably authorizes LaSalle to
          disburse the proceeds of each Revolving Loan, each Capex Loan, each
          M&E Loan and each Term Loan requested by Borrower, or deemed to be
          requested by Borrower, as follows: (i) the proceeds of each Revolving
          Loan, each Capex Loan, each M&E Loan, each Term Loan requested under
          paragraph 6(a)(i), shall be disbursed by LaSalle in lawful money of
          the United States of America in immediately available funds, by wire
          transfer to such bank account as may be agreed upon by Borrower and
          LaSalle from time to time, or elsewhere if pursuant to a written
          direction from Borrower; and (ii) the proceeds of each Revolving Loan
          requested under paragraph 6(a)(ii), and the proceeds of each Term Loan
          requested or deemed requested under paragraph 6(a)(iii), shall be
          disbursed by LaSalle by way of direct payment of the relevant interest
          or other liability."

     (i)  Section 6(c)(iii) of the Loan Agreement is hereby amended by deleting
          subsections C. and D. in their entirety and replacing the same with
          the following:

          "C. there shall not be outstanding at any one time more than an
          aggregate of two (2) LIBOR Rate Revolving Loans, two (2) LIBOR Rate
          Capex Loans and two (2) LIBOR Rate M&E Loans;

          D. any LIBOR Rate Capex Loan and any LIBOR Rate M&E Loan shall be in a
          minimum amount of $1,000,000 or an integral multiple of $250,000 in
          excess thereof; and".

     (j)  Section 12(a) of the Loan Agreement is hereby amended by deleting the
          date "August 1, 2003" contained therein and replacing the same with
          the date "August 1, 2004".

     (k)  Section 12(b) of the Loan Agreement is hereby amended by deleting said
          Section in its entirety and replacing the same with the following:

          "(b) If, for any reason, this Agreement is terminated prior to the end
          of the Original Term or any Renewal Term including, in the sole
          discretion of LaSalle, if an effective termination results from
          Borrower prepaying all or substantially all of the Liabilities,
          Borrower agrees to pay to LaSalle, as a prepayment fee, in addition to
          the payment of all other Liabilities owing by Borrower, an amount
          equal to: (i) three percent (3.0%) of the Total Credit Facility if
          this Agreement is terminated during the first year of the Original
          Term; (ii) two percent (2.0%) of the Total Credit Facility if this
          Agreement is terminated during the second year of the Original Term;
          and (iii) one percent (1.0%) of the Total Credit Facility if this
          Agreement is terminated during the third year of the Original Term or
          any time thereafter, except, if terminated at the end of the Original
          Term or any Renewal Term pursuant to the terms set forth herein.
          Notwithstanding the foregoing, unless and until such time as the Debt
          Service Coverage Ratio condition described in the last sentence of

                                      -7-

<PAGE>

          paragraph 3.B. of this Agreement is satisfied, the prepayment fee
          described herein shall be calculated by applying the applicable
          percentage to an amount equal to (1) the Total Credit Facility, minus
          (2) $3,500,000. In light of the extreme difficulty of accurately
          calculating actual damages arising out of any early termination,
          LaSalle and Borrower have agreed that the prepayment fee provided for
          above is a reasonable estimate of actual damages that would be
          incurred."

     (l)  Section 14(n)(i) of the Loan Agreement is hereby amended by deleting
          said Section in its entirety and replacing the same with the
          following:

          "(i)Tangible Net Worth. Borrower shall maintain, on an aggregate basis
          with all Affiliates of Borrower, as of the end of (A) the fiscal
          quarter ending June 2, 2001, a Tangible Net Worth of not less than
          nine million five hundred thousand dollars ($9,500,000); (B) the
          fiscal year ending August 31, 2001, a Tangible Net Worth of not less
          than ten million dollars ($10,000,000), (C) the fiscal year ending
          August 31, 2002 and each fiscal year end thereafter, a Tangible Net
          Worth of not less than five hundred thousand dollars ($500,000) in
          excess of the actual Tangible Net Worth as of the previous fiscal year
          end, and (D) each fiscal quarter after the fiscal year ending August
          31, 2001, a Tangible Net Worth of not less than ninety percent (90%)
          of the actual Tangible Net Worth for the most recently ended fiscal
          year."

     (m)  Section 14(n)(ii) of the Loan Agreement is hereby amended by deleting
          said Section in its entirety and replacing the same with the
          following:

          "(ii) Interest Coverage Ratio. Borrower shall maintain, on an
          aggregate basis with all Affiliates of Borrower, as of the end of each
          fiscal quarter, commencing with the fiscal quarter ending August 31,
          2001 (and measured on a cumulative fiscal year-to-date basis beginning
          with the fiscal quarter ending March 2, 2002) a ratio of (A) net
          income, plus interest, taxes, depreciation and amortization, less
          unfinanced Capital Expenditures (except that unfinanced Capital
          Expenditures made during the fiscal year ending August 31, 2002 shall
          be deducted only to the extent they exceed $2,500,000 in the
          aggregate) to (B) interest expense, of not less than 1.50 to 1.00;"

     (n)  Section 14(n)(iii) of the Loan Agreement is hereby amended by deleting
          said Section in its entirety and replacing the same with the
          following:

          "(iii) Debt Service Coverage Ratio. Borrower shall maintain, on an
          aggregate basis with all Affiliates of Borrower, a Debt Service
          Coverage Ratio, (1) as of the fiscal quarters ending March 2, 2002 and
          June 1, 2002 of not less than 1.0 to 1.0, and (2) as of the end of the
          fiscal quarter ending August 31, 2002 and each fiscal quarter
          thereafter, of not less than 1.25 to 1.00."

                                      -8-

<PAGE>

     (o)  The Loan Agreement is hereby amended by deleting Exhibit C and Exhibit
          D attached thereto and replacing the same with Exhibit C and Exhibit D
          attached hereto;

     (p)  The Loan Agreement is hereby amended by attaching thereto as Exhibit E
          the form of M&E Note attached hereto as Exhibit E.

3. Except for the specific waivers set forth in the waiver letter signed by the
Lender of even date herewith, Lender is not waiving any Default, Event of
Default, covenant, violation, or breach of the Loan Agreement or any of the
Other Agreements, whether or not known to the Lender and whether or not existing
on the date hereof or any other event, circumstance or condition which with the
giving of notice or the passage of time, or both, would constitute a Default,
Event of Default, violation or breach of the Loan Agreement or any of the Other
Agreements. Lender specifically reserves the right to exercise any and all
rights and remedies available to it under the Loan Agreement and the documents
related thereto in the event of a Default or an Event of Default at any time in
the future. Without limiting the foregoing, Lender expects that the Borrower
will maintain compliance with all its covenants under and relating to the Loan
Agreement, including the covenant regarding Tangible Net Worth, the covenant
regarding Interest Coverage Ratio and the covenant regarding Debt Service
Coverage Ratio, and Lender will closely monitor the same in the future to
ascertain such continued compliance. The failure or forbearance by Lender to
exercise any of its rights or remedies at any time shall not constitute a waiver
of any such rights or remedies.

4. Except as explicitly amended by this Amendment, all of the terms and
conditions of the Loan Agreement shall remain in full force and effect and shall
apply to any advance thereunder.

5. This Amendment shall be effective upon receipt by the Lender of an executed
original hereof, together with such promissory notes, resolutions, opinions of
counsel and other documents, instruments and agreements as the Lender may
require.

6. The Borrower hereby represents and warrants to the Lender as follows:

     (a)  The Borrower has requisite power and authority to execute this
          Amendment and to perform all of its obligations hereunder, and this
          Amendment has been duly executed and delivered by the Borrower and
          constitutes the legal, valid and binding obligation of the Borrower,
          enforceable in accordance with its terms.

     (b)  The execution, delivery and performance by the Borrower of this
          Amendment have been duly authorized by all necessary corporate action
          and do not (i) require any authorization, consent or approval by any
          governmental department, commission, board, bureau, agency or
          instrumentality, domestic or foreign, (ii) violate any provision of
          any law, rule or regulation or of any order, writ, injunction or
          decree presently in effect, having applicability to the Borrower, or
          the articles of incorporation or by-laws of the Borrower, or (iii)
          result in a breach of or constitute a default under any indenture or
          loan Agreement or any other agreement, lease or instrument to which
          the Borrower is a party or by which it or its properties may be bound
          or affected, except that the consent of U.S. Bank National Association
          ("US Bank") is required under the Business Loan Agreement dated May
          24, 1999 with US Bank (the "US Bank Agreement") for any additional
          indebtedness incurred after the date of the US Bank Agreement.

                                      -9-

<PAGE>

         (c) All of the representations and warranties contained in paragraph
         13. of the Loan Agreement are correct on and as of the date hereof as
         though made on and as of such date, except to the extent that such
         representations and warranties relate solely to an earlier date, and
         except to the extent that such representations and warranties are
         incorrect as a result of a failure to obtain the above-described
         consent under the US Bank Agreement.

7. All references in the Loan Agreement to "this Agreement" shall be deemed to
refer to the Loan Agreement as amended hereby; and any and all references in the
Other Agreements to the Loan Agreement shall be deemed to refer to the Loan
Agreement as amended hereby.

8. On or before November 30, 2001, the Borrower shall either pay in full all
amounts owed to US Bank or obtain the written consent of US Bank to the
transactions described in this Amendment. Failure to satisfy this covenant shall
constitute an Event of Default under the Loan Agreement.

9. The Borrower hereby absolutely and unconditionally releases and forever
discharges the Lender, and any and all participants, parent corporations,
subsidiary corporations, affiliated corporations, insurers, indemnitors,
successors and assigns thereof, together with all of the present and former
directors, officers, agents and employees of any of the foregoing, from any and
all claims, demands or causes of action of any kind, nature or description,
whether arising in law or equity or upon contract or tort or under any state or
federal law or otherwise, which the Borrower has had, now has or has made claim
to have against any such person for or by reason of any act, omission, matter,
cause or thing whatsoever arising from the beginning of time to and including
the date of this Amendment, whether such claims, demands and causes of action
are matured or unmatured or known or unknown.

10. The Borrower hereby reaffirms its agreement under the Loan Agreement to pay
or reimburse the Lender on demand for all costs and expenses incurred by the
Lender in connection with the Loan Agreement, the Other Agreements and all other
documents contemplated thereby, including without limitation all reasonable fees
and disbursements of legal counsel. Without limiting the generality of the
foregoing, the Borrower specifically agrees to pay all fees and disbursements of
counsel to the Lender, for the services performed by such counsel in connection
with the preparation of this Amendment and the documents and instruments
incidental hereto. The Borrower hereby agrees that the Lender may, at any time
or from time to time in its sole discretion and without further authorization by
the Borrower, make a loan to the Borrower under the Loan Agreement, or apply the
proceeds of any loan, for the purpose of paying any such fees, disbursements,
costs and expenses.

11. This Amendment may be executed in any number of counterparts, each of which
when so executed and delivered shall be deemed an original and all of which
counterparts, taken together, shall constitute one and the same instrument.

                                      -10-

<PAGE>

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly
executed effective as of the day and year first above written.

                                       HEI, INC.

                                       By: _____________________________________

                                           Its: ________________________________

                                       CROSS TECHNOLOGY, INC.

                                       By: _____________________________________

                                           Its: ________________________________

                                       LASALLE BUSINESS CREDIT, INC.

                                       By: _____________________________________

                                           Its: ________________________________

                                      -11-

<PAGE>

                                                                       EXHIBIT C

                            CAPITAL EXPENDITURE NOTE

EXECUTED AS OF THE ____ OF ________, 20__                      AMOUNT $_________

     FOR VALUE RECEIVED, the undersigned ("Borrower"), hereby jointly and
severally promise to pay to the order of LASALLE BUSINESS CREDIT, INC., a
Delaware corporation ("Lender"), in such coin or currency of the United States
which shall be legal tender in payment of all debts and dues, public and
private, at the time of payment, the principal sum of
__________________________________________ AND 00/100 DOLLARS ($___________),
together with interest from and after the date hereof on the unpaid principal
balance outstanding at the Prime Rate plus ______________ Percent (____%), as
the same changes in accordance with this Note, or as otherwise set forth in the
Loan and Security Agreement between Borrower and Lender dated July 31, 2000, as
amended ("Loan Agreement").

     This Capital Expenditure Note ("Note") is one of the Capex Notes referred
to in, and is issued pursuant to, the Loan Agreement and is entitled to all of
the benefits and security of the Loan Agreement. All of the terms, covenants and
conditions of the Loan Agreement and all other instruments evidencing or
securing the indebtedness hereunder are hereby made a part of this Note and are
deemed incorporated herein in full. All capitalized terms used herein, unless
otherwise specifically defined in this Note, shall have the meanings ascribed to
them in the Loan Agreement.

     Borrower acknowledges and understands that the Prime Rate merely serves as
a basis upon which effective rates of interest are calculated for loans making
reference to the per annum rate of interest publicly announced by LaSalle
National Bank at its office in Chicago, Illinois, from time to time as its Prime
Rate for commercial loans and that such rate may not be the lowest or best rate
at which such bank calculates interest or extends credit. The Prime Rate as of
the date of this Note is _________________ Percent (_____%) per annum and,
accordingly, the interest rate in effect hereunder as of the date hereof,
expressed in simple interest terms, is ______________________ Percent (_____%).
After the date hereof, the rate of interest in effect hereunder shall be
increased or decreased, as the case may be, by an amount equal to any increase
or decrease in the Prime Rate, with such adjustments to be effective as of the
opening of business on the date that any such change in the Prime Rate becomes
effective. The Prime Rate in effect on the date hereof shall be the Prime Rate
effective as of the opening of business on the date hereof, but if this Note is
executed on a day that is not a business day, the Prime Rate in effect on the
date hereof shall be the Prime Rate effective as of the opening of business on
the last business day immediately preceding the date hereof. Interest hereunder
shall be computed on the basis of actual days elapsed over the period of a
360-day year. If any Event of Default shall occur then, at Lender's option, the
outstanding principal balance of this Note shall bear interest from and after
the occurrence of such Event of Default at a variable rate per annum equal to
the default rate set forth in the Loan Agreement until either the Event of
Default is cured with Lender's permission and to Lender's satisfaction or the
principal balance of this Note is paid in full.

<PAGE>

     In no contingency or event whatsoever, whether by reason of advancement of
the proceeds hereof or otherwise, shall the amount paid or agreed to be paid to
Lender for the use, forbearance or detention of money advanced hereunder exceed
the Highest Lawful Rate permissible under any law which a court of competent
jurisdiction may deem applicable hereto.

     Regardless of any provision contained herein, the holder hereof shall never
be entitled to receive, collect, or apply as interest on this Note, any amount
in excess of the Highest Lawful Rate and, in the event the holder hereof ever
receives, collects, or applies as interest, any such excess, such amount which
would be excessive interest shall be deemed a partial prepayment of principal
and treated hereunder as such; and, if the principal hereof is paid in full, any
remaining excess shall forthwith be paid to the Undersigned. In determining
whether or not the interest paid or payable, under any specific contingency,
exceeds the Highest Lawful Rate, the Undersigned and the holder hereof shall, to
the maximum extent permitted under applicable law, (a) treat all advances
hereunder as but a single extension of credit, (b) characterize any nonprincipal
payment as an expense, fee, or premium rather than as interest, (c) exclude
voluntary prepayments and the effects thereof, and (d) "spread" the total amount
of interest throughout the entire contemplated term hereof; provided that, if
the principal hereof is paid in full prior to the end of the full contemplated
term hereof, and if the interest received for the actual period of existence
thereof exceeds the Highest Lawful Rate, the holder hereof shall refund to the
Undersigned the amount of such excess, and, in such event, the holder hereof
shall not be subject to any penalties provided by any laws for contracting for,
charging, taking, reserving, or receiving interest in excess of the Highest
Lawful Rate. As used herein, the term the "Highest Lawful Rate" means the
maximum rate of interest (or, if the context so requires, an amount calculated
at such rate) which the holder hereof is allowed to contract for, charge, take,
reserve, or receive under applicable law after taking into account, to the
extent required by applicable law, any and all relevant payments or charges made
in connection with this Note.

     For so long as no Event of Default shall have occurred under the Loan
Agreement, the principal amount and accrued interest of this Note shall be due
and payable on the dates and in the manner hereinafter set forth:

     (a)  Interest shall be due and payable monthly, in arrears, on the first
          day of each month, commencing on ______________ ___, 20__, and
          continuing until such time as the full principal balance, together
          with all other amounts owing hereunder, shall have been paid in full;

     (b)  Commencing on _____________ ___, 20__, and continuing on the first day
          of each month thereafter to and including the first day of
          ______________, 20__, principal payments in the amount of
          _______________________________ AND __/100 DOLLARS ($_____________)
          each;

                                      C-2

<PAGE>

     (c)  On _________ ___, 20__, a final principal payment equal to the entire
          unpaid principal balance hereof, together with any and all other
          amounts due hereunder.

Any payments applied to principal under this Note are intended to permanently
reduce the outstanding amount of the Note and may not be re-borrowed.
Notwithstanding the foregoing, the entire unpaid principal balance and accrued
interest on this Note shall be due and payable immediately upon any termination
of the Loan Agreement. Borrower may voluntarily prepay this Note in whole at any
time, from time to time, provided that such prepayment shall be made together
with accrued interest on the principal amount so prepaid at the prepayment date
plus the early termination fee as set forth in the Loan Agreement.

     The occurrence of an Event of Default under the Loan Agreement, including
the failure to pay any installment of principal or interest in full on the due
date thereof in accordance with the terms of this Note, shall constitute an
event of default under this Note and shall entitle Lender, at its option, to
declare the then outstanding principal balance and accrued interest hereof to
be, and the same shall thereupon become, immediately due and payable without
notice to or demand upon Borrower, all of which Borrower hereby expressly
waives. If this Note is collected by or through an attorney at law, then
Borrower shall be obligated to pay, in addition to the principal balance and
accrued interest hereof, reasonable attorney's fees, not to exceed Fifteen
Percent (15%) of such principal and interest, and court costs.

     Borrower represents and warrants that the proceeds of this note are to be
used by Borrower exclusively for non-consumer purposes.

     Time is of the essence of this Note. To the fullest extend permitted by
applicable law, Borrower, for itself and its legal representatives, successors
and assigns, expressly waives presentment, demand, protest, notice of dishonor,
notice of non-payment, notice of maturity, notice of protest, presentment for
the purpose of accelerating maturity, diligence in collection, and the benefit
of any exemption or insolvency laws.

     Wherever possible each provision of this Note shall be interpreted in such
a manner as to be effective and valid under applicable law, but if any provision
of this Note shall be prohibited or invalid under applicable law, such provision
shall be ineffective to the extent of such prohibition or invalidity without
invalidating the remainder of such provision or remaining provisions of this
Note. No delay or failure on the part of Lender in the exercise of any right or
remedy hereunder shall operate as a waiver thereof, nor as an acquiescence in
any default, nor shall any single or partial exercise by Lender of any right or
remedy preclude any other right or remedy. Lender, at its option, may enforce
its rights against any collateral securing this Note without enforcing its
rights against Borrower, any guarantor of the indebtedness evidenced hereby or
any other property or indebtedness due or to become due to Borrower. Borrower
agrees that, without releasing or impairing Borrower's liability hereunder,
Lender may at any time release, surrender, substitute or exchange any collateral
securing this Note and may at any time release any party primarily or
secondarily liable for the indebtedness evidenced by this Note.

                                      C-3

<PAGE>

     This Note shall be governed by, and construed and enforced in accordance
with, the laws of the State of Illinois, and is intended to take effect as an
instrument under seal.

     IN WITNESS WHEREOF, Borrower has caused this Note to be duly executed,
sealed and delivered on the date first above written.

                                       HEI, INC.
                                       a Minnesota corporation

                                       -----------------------------------------
                                       By:  Steve E. Tondera
                                       Title:  CFO

                                       CROSS TECHNOLOGY, INC.
                                       a Minnesota corporation

                                       -----------------------------------------
                                       By:  Steve E. Tondera
                                       Title:  CFO

                                      C-4

<PAGE>

ACKNOWLEDGMENT OF SIGNATURE

STATE OF MINNESOTA          )
                            )  SS.
COUNTY OF HENNEPIN          )

     I, ______________________________, a Notary Public in and for the state and
county aforesaid, do hereby certify that before me this day personally appeared
Steve E. Tondera, the CFO of HEI, Inc., known to me to be the same person whose
name is subscribed to the foregoing Capital Expenditure Note, and acknowledged
to me that he executed and delivered the foregoing Capital Expenditure Note as
his free and voluntary act, for the uses set forth therein.

     IN WITNESS WHEREOF, I have hereunto set my hand and official seal this ____
day of _____________, 20__.

                                       ----------------------------------------
                                       Notary Public

                                       My Commission Expires:

                                       ----------------------------------------

STATE OF MINNESOTA          )
                            )  SS.
COUNTY OF HENNEPIN          )

     I, ______________________________, a Notary Public in and for the state and
county aforesaid, do hereby certify that before me this day personally appeared
Steve E. Tondera, the CFO of Cross Technology, Inc., known to me to be the same
person whose name is subscribed to the foregoing Capital Expenditure Note, and
acknowledged to me that he executed and delivered the foregoing Capital
Expenditure Note as his free and voluntary act, for the uses set forth therein.

     IN WITNESS WHEREOF, I have hereunto set my hand and official seal this ____
day of _____________, 20__.

                                       ----------------------------------------
                                       Notary Public

                                       My Commission Expires:

                                       ----------------------------------------

                                      C-5

<PAGE>

                                                                       EXHIBIT D

                                   TERM NOTE

EXECUTED AS OF THE _____ OF __________, 20___             AMOUNT $______________

     FOR VALUE RECEIVED, the undersigned ("Borrower"), hereby jointly and
severally promise to pay to the order of LASALLE BUSINESS CREDIT, INC., a
Delaware corporation ("Lender"), in such coin or currency of the United States
which shall be legal tender in payment of all debts and dues, public and
private, at the time of payment, the principal sum of
_______________________________________________________ AND ___/100 DOLLARS
($______________), together with interest from and after the date hereof on the
unpaid principal balance outstanding at the Prime Rate plus Four Percent (4.0%),
as the same changes in accordance with this Note, or as otherwise set forth in
the Loan and Security Agreement between Borrower and Lender dated as of July 31,
2000, as amended ("Loan Agreement").

     This Term Note ("Note") is a Term Note referred to in, and is issued
pursuant to, the Loan Agreement and is entitled to all of the benefits and
security of the Loan Agreement. All of the terms, covenants and conditions of
the Loan Agreement and all other instruments evidencing or securing the
indebtedness hereunder are hereby made a part of this Note and are deemed
incorporated herein in full. All capitalized terms used herein, unless otherwise
specifically defined in this Note, shall have the meanings ascribed to them in
the Loan Agreement.

     Borrower acknowledges and understands that the Prime Rate merely serves as
a basis upon which effective rates of interest are calculated for loans making
reference to the per annum rate of interest publicly announced by LaSalle
National Bank at its office in Chicago, Illinois, from time to time as its Prime
Rate for commercial loans and that such rate may not be the lowest or best rate
at which such bank calculates interest or extends credit. The Prime Rate as of
the date of this Note is ______________________ Percent (____%) per annum and,
accordingly, the interest rate in effect hereunder as of the date hereof,
expressed in simple interest terms, is ________________________ Percent (____%).
After the date hereof, the rate of interest in effect hereunder shall be
increased or decreased, as the case may be, by an amount equal to any increase
or decrease in the Prime Rate, with such adjustments to be effective as of the
opening of business on the date that any such change in the Prime Rate becomes
effective. The Prime Rate in effect on the date hereof shall be the Prime Rate
effective as of the opening of business on the date hereof, but if this Note is
executed on a day that is not a business day, the Prime Rate in effect on the
date hereof shall be the Prime Rate effective as of the opening of business on
the last business day immediately preceding the date hereof. Interest hereunder
shall be computed on the basis of actual days elapsed over the period of a
360-day year. If any Event of Default shall occur then, at Lender's option, the
outstanding principal balance of this Note shall bear interest from and after
the occurrence of such Event of Default at a variable rate per annum equal to
the default rate set forth in the Loan Agreement until either the Event of
Default is cured with Lender's permission and to Lender's satisfaction or the
principal balance of this Note is paid in full.

<PAGE>

                  In no contingency or event whatsoever, whether by reason of
advancement of the proceeds hereof or otherwise, shall the amount paid or agreed
to be paid to Lender for the use, forbearance or detention of money advanced
hereunder exceed the Highest Lawful Rate permissible under any law which a court
of competent jurisdiction may deem applicable hereto.

     Regardless of any provision contained herein, the holder hereof shall never
be entitled to receive, collect, or apply as interest on this Note, any amount
in excess of the Highest Lawful Rate and, in the event the holder hereof ever
receives, collects, or applies as interest, any such excess, such amount which
would be excessive interest shall be deemed a partial prepayment of principal
and treated hereunder as such; and, if the principal hereof is paid in full, any
remaining excess shall forthwith be paid to the Undersigned. In determining
whether or not the interest paid or payable, under any specific contingency,
exceeds the Highest Lawful Rate, the Undersigned and the holder hereof shall, to
the maximum extent permitted under applicable law, (a) treat all advances
hereunder as but a single extension of credit, (b) characterize any nonprincipal
payment as an expense, fee, or premium rather than as interest, (c) exclude
voluntary prepayments and the effects thereof, and (d) "spread" the total amount
of interest throughout the entire contemplated term hereof; provided that, if
the principal hereof is paid in full prior to the end of the full contemplated
term hereof, and if the interest received for the actual period of existence
thereof exceeds the Highest Lawful Rate, the holder hereof shall refund to the
Undersigned the amount of such excess, and, in such event, the holder hereof
shall not be subject to any penalties provided by any laws for contracting for,
charging, taking, reserving, or receiving interest in excess of the Highest
Lawful Rate. As used herein, the term the "Highest Lawful Rate" means the
maximum rate of interest (or, if the context so requires, an amount calculated
at such rate) which the holder hereof is allowed to contract for, charge, take,
reserve, or receive under applicable law after taking into account, to the
extent required by applicable law, any and all relevant payments or charges made
in connection with this Note.

     For so long as no Event of Default shall have occurred under the Loan
Agreement, the principal amount and accrued interest of this Note shall be due
and payable on the dates and in the manner hereinafter set forth:

     (a)  Interest shall be due and payable monthly, in arrears, on the first
          day of each month, commencing on ________ 1, 20__, and continuing
          until such time as the full principal balance, together with all other
          amounts owing hereunder, shall have been paid in full;

     (b)  Commencing on ___________ 1, 20__, and continuing on the first day of
          each month thereafter to and including the first day of ___________,
          20__, principal payments in the amount of
          _____________________________________________ AND __/100 DOLLARS
          ($_____________) each;

                                      D-2

<PAGE>

     (c)  On ____________ 1, 20__, a final principal payment equal to the entire
          unpaid principal balance hereof, together with any and all other
          amounts due hereunder.

Any payments applied to principal under this Note are intended to permanently
reduce the outstanding amount of the Note and may not be re-borrowed.
Notwithstanding the foregoing, the entire unpaid principal balance and accrued
interest on this Note shall be due and payable immediately upon any termination
of the Loan Agreement. Borrower may voluntarily prepay this Note in whole at any
time, from time to time, provided that such prepayment shall be made together
with accrued interest on the principal amount so prepaid at the prepayment date
plus the early termination fee as set forth in the Loan Agreement.

     The occurrence of an Event of Default under the Loan Agreement, including
the failure to pay any installment of principal or interest in full on the due
date thereof in accordance with the terms of this Note, shall constitute an
event of default under this Note and shall entitle Lender, at its option, to
declare the then outstanding principal balance and accrued interest hereof to
be, and the same shall thereupon become, immediately due and payable without
notice to or demand upon Borrower, all of which Borrower hereby expressly
waives. If this Note is collected by or through an attorney at law, then
Borrower shall be obligated to pay, in addition to the principal balance and
accrued interest hereof, reasonable attorney's fees, not to exceed Fifteen
Percent (15%) of such principal and interest, and court costs.

     Borrower represents and warrants that the proceeds of this note are to be
used by Borrower exclusively for non-consumer purposes.

     Time is of the essence of this Note. To the fullest extend permitted by
applicable law, Borrower, for itself and its legal representatives, successors
and assigns, expressly waives presentment, demand, protest, notice of dishonor,
notice of non-payment, notice of maturity, notice of protest, presentment for
the purpose of accelerating maturity, diligence in collection, and the benefit
of any exemption or insolvency laws.

     Wherever possible each provision of this Note shall be interpreted in such
a manner as to be effective and valid under applicable law, but if any provision
of this Note shall be prohibited or invalid under applicable law, such provision
shall be ineffective to the extent of such prohibition or invalidity without
invalidating the remainder of such provision or remaining provisions of this
Note. No delay or failure on the part of Lender in the exercise of any right or
remedy hereunder shall operate as a waiver thereof, nor as an acquiescence in
any default, nor shall any single or partial exercise by Lender of any right or
remedy preclude any other right or remedy. Lender, at its option, may enforce
its rights against any collateral securing this Note without enforcing its
rights against Borrower, any guarantor of the indebtedness evidenced hereby or
any other property or indebtedness due or to become due to Borrower. Borrower
agrees that, without releasing or impairing Borrower's liability hereunder,
Lender may at any time release, surrender, substitute or exchange any collateral
securing this Note and may at any time release any party primarily or
secondarily liable for the indebtedness evidenced by this Note.

                                      D-3

<PAGE>

     This Note shall be governed by, and construed and enforced in accordance
with, the laws of the State of Illinois, and is intended to take effect as an
instrument under seal.

     IN WITNESS WHEREOF, Borrower has caused this Note to be duly executed,
sealed and delivered on the date first above written.

                                       HEI, INC.
                                       a Minnesota corporation

                                       -----------------------------------------
                                       By:  Steve E. Tondera
                                       Title:  CFO

                                       CROSS TECHNOLOGY, INC.
                                       a Minnesota corporation

                                       -----------------------------------------
                                       By:  Steve E. Tondera
                                       Title:  CFO

                                      D-4

<PAGE>

ACKNOWLEDGMENT OF SIGNATURES

STATE OF MINNESOTA          )
                            )  SS.
COUNTY OF ___________       )

     I, ______________________________, a Notary Public in and for the state and
county aforesaid, do hereby certify that before me this day personally appeared
Steve E. Tondera, the CFO of HEI, Inc., known to me to be the same person whose
name is subscribed to the foregoing Term Note, and acknowledged to me that he
executed and delivered the foregoing Term Note as his free and voluntary act,
for the uses set forth therein.

     IN WITNESS WHEREOF, I have hereunto set my hand and official seal this
______ day of ______________, 20__.

                                       -----------------------------------------
                                       Notary Public

                                       My Commission Expires:

                                       -----------------------------------------

STATE OF MINNESOTA          )
                            )  SS.
COUNTY OF ___________       )

     I, ______________________________, a Notary Public in and for the state and
county aforesaid, do hereby certify that before me this day personally appeared
Steve E. Tondera, the CFO of Cross Technology, Inc., known to me to be the same
person whose name is subscribed to the foregoing Term Note, and acknowledged to
me that he executed and delivered the foregoing Term Note as his free and
voluntary act, for the uses set forth therein.

     IN WITNESS WHEREOF, I have hereunto set my hand and official seal this
______ day of ______________, 20__.

                                       -----------------------------------------
                                       Notary Public

                                       My Commission Expires:

                                       -----------------------------------------

                                      D-5

<PAGE>

                                                                       EXHIBIT E

                           MACHINERY & EQUIPMENT NOTE

EXECUTED AS OF THE ____ OF ________, 20__                      AMOUNT $_________

     FOR VALUE RECEIVED, the undersigned ("Borrower"), hereby jointly and
severally promise to pay to the order of LASALLE BUSINESS CREDIT, INC., a
Delaware corporation ("Lender"), in such coin or currency of the United States
which shall be legal tender in payment of all debts and dues, public and
private, at the time of payment, the principal sum of
__________________________________________ AND 00/100 DOLLARS ($___________),
together with interest from and after the date hereof on the unpaid principal
balance outstanding at the Prime Rate plus ______________ Percent (____%), as
the same changes in accordance with this Note, or as otherwise set forth in the
Loan and Security Agreement between Borrower and Lender dated July 31, 2000, as
amended ("Loan Agreement").

     This Machinery & Equipment Note ("Note") is a M&E Note referred to in, and
is issued pursuant to, the Loan Agreement and is entitled to all of the benefits
and security of the Loan Agreement. All of the terms, covenants and conditions
of the Loan Agreement and all other instruments evidencing or securing the
indebtedness hereunder are hereby made a part of this Note and are deemed
incorporated herein in full. All capitalized terms used herein, unless otherwise
specifically defined in this Note, shall have the meanings ascribed to them in
the Loan Agreement.

     Borrower acknowledges and understands that the Prime Rate merely serves as
a basis upon which effective rates of interest are calculated for loans making
reference to the per annum rate of interest publicly announced by LaSalle
National Bank at its office in Chicago, Illinois, from time to time as its Prime
Rate for commercial loans and that such rate may not be the lowest or best rate
at which such bank calculates interest or extends credit. The Prime Rate as of
the date of this Note is _________________________ Percent (____%) per annum
and, accordingly, the interest rate in effect hereunder as of the date hereof,
expressed in simple interest terms, is _____________________ Percent (_____%).
After the date hereof, the rate of interest in effect hereunder shall be
increased or decreased, as the case may be, by an amount equal to any increase
or decrease in the Prime Rate, with such adjustments to be effective as of the
opening of business on the date that any such change in the Prime Rate becomes
effective. The Prime Rate in effect on the date hereof shall be the Prime Rate
effective as of the opening of business on the date hereof, but if this Note is
executed on a day that is not a business day, the Prime Rate in effect on the
date hereof shall be the Prime Rate effective as of the opening of business on
the last business day immediately preceding the date hereof. Interest hereunder
shall be computed on the basis of actual days elapsed over the period of a
360-day year. If any Event of Default shall occur then, at Lender's option, the
outstanding principal balance of this Note shall bear interest from and after
the occurrence of such Event of Default at a variable rate per annum equal to
the default rate set forth in the Loan Agreement until either the Event of
Default is cured with Lender's permission and to Lender's satisfaction or the
principal balance of this Note is paid in full.

<PAGE>

     In no contingency or event whatsoever, whether by reason of advancement of
the proceeds hereof or otherwise, shall the amount paid or agreed to be paid to
Lender for the use, forbearance or detention of money advanced hereunder exceed
the Highest Lawful Rate permissible under any law which a court of competent
jurisdiction may deem applicable hereto.

     Regardless of any provision contained herein, the holder hereof shall never
be entitled to receive, collect, or apply as interest on this Note, any amount
in excess of the Highest Lawful Rate and, in the event the holder hereof ever
receives, collects, or applies as interest, any such excess, such amount which
would be excessive interest shall be deemed a partial prepayment of principal
and treated hereunder as such; and, if the principal hereof is paid in full, any
remaining excess shall forthwith be paid to the Undersigned. In determining
whether or not the interest paid or payable, under any specific contingency,
exceeds the Highest Lawful Rate, the Undersigned and the holder hereof shall, to
the maximum extent permitted under applicable law, (a) treat all advances
hereunder as but a single extension of credit, (b) characterize any nonprincipal
payment as an expense, fee, or premium rather than as interest, (c) exclude
voluntary prepayments and the effects thereof, and (d) "spread" the total amount
of interest throughout the entire contemplated term hereof; provided that, if
the principal hereof is paid in full prior to the end of the full contemplated
term hereof, and if the interest received for the actual period of existence
thereof exceeds the Highest Lawful Rate, the holder hereof shall refund to the
Undersigned the amount of such excess, and, in such event, the holder hereof
shall not be subject to any penalties provided by any laws for contracting for,
charging, taking, reserving, or receiving interest in excess of the Highest
Lawful Rate. As used herein, the term the "Highest Lawful Rate" means the
maximum rate of interest (or, if the context so requires, an amount calculated
at such rate) which the holder hereof is allowed to contract for, charge, take,
reserve, or receive under applicable law after taking into account, to the
extent required by applicable law, any and all relevant payments or charges made
in connection with this Note.

     For so long as no Event of Default shall have occurred under the Loan
Agreement, the principal amount and accrued interest of this Note shall be due
and payable on the dates and in the manner hereinafter set forth:

     (a)  Interest shall be due and payable monthly, in arrears, on the first
          day of each month, commencing on _________ ___, 20__, and continuing
          until such time as the full principal balance, together with all other
          amounts owing hereunder, shall have been paid in full;

     (b)  Commencing on ____________ ___, 20__, and continuing on the first day
          of each month thereafter to and including the first day of
          ___________, 20__, principal payments in the amount of
          _______________________________ AND __/100 DOLLARS ($_______________)
          each;

                                      E-2

<PAGE>

     (c)  On ____________ ___, 20__, a final principal payment equal to the
          entire unpaid principal balance hereof, together with any and all
          other amounts due hereunder.

Any payments applied to principal under this Note are intended to permanently
reduce the outstanding amount of the Note and may not be re-borrowed.
Notwithstanding the foregoing, the entire unpaid principal balance and accrued
interest on this Note shall be due and payable immediately upon any termination
of the Loan Agreement. Borrower may voluntarily prepay this Note in whole at any
time, from time to time, provided that such prepayment shall be made together
with accrued interest on the principal amount so prepaid at the prepayment date
plus the early termination fee as set forth in the Loan Agreement.

     The occurrence of an Event of Default under the Loan Agreement, including
the failure to pay any installment of principal or interest in full on the due
date thereof in accordance with the terms of this Note, shall constitute an
event of default under this Note and shall entitle Lender, at its option, to
declare the then outstanding principal balance and accrued interest hereof to
be, and the same shall thereupon become, immediately due and payable without
notice to or demand upon Borrower, all of which Borrower hereby expressly
waives. If this Note is collected by or through an attorney at law, then
Borrower shall be obligated to pay, in addition to the principal balance and
accrued interest hereof, reasonable attorney's fees, not to exceed Fifteen
Percent (15%) of such principal and interest, and court costs.

     Borrower represents and warrants that the proceeds of this note are to be
used by Borrower exclusively for non-consumer purposes.

     Time is of the essence of this Note. To the fullest extend permitted by
applicable law, Borrower, for itself and its legal representatives, successors
and assigns, expressly waives presentment, demand, protest, notice of dishonor,
notice of non-payment, notice of maturity, notice of protest, presentment for
the purpose of accelerating maturity, diligence in collection, and the benefit
of any exemption or insolvency laws.

     Wherever possible each provision of this Note shall be interpreted in such
a manner as to be effective and valid under applicable law, but if any provision
of this Note shall be prohibited or invalid under applicable law, such provision
shall be ineffective to the extent of such prohibition or invalidity without
invalidating the remainder of such provision or remaining provisions of this
Note. No delay or failure on the part of Lender in the exercise of any right or
remedy hereunder shall operate as a waiver thereof, nor as an acquiescence in
any default, nor shall any single or partial exercise by Lender of any right or
remedy preclude any other right or remedy. Lender, at its option, may enforce
its rights against any collateral securing this Note without enforcing its
rights against Borrower, any guarantor of the indebtedness evidenced hereby or
any other property or indebtedness due or to become due to Borrower. Borrower
agrees that, without releasing or impairing Borrower's liability hereunder,
Lender may at any time release, surrender, substitute or exchange any collateral
securing this Note and may at any time release any party primarily or
secondarily liable for the indebtedness evidenced by this Note.

                                      E-3

<PAGE>

     This Note shall be governed by, and construed and enforced in accordance
with, the laws of the State of Illinois, and is intended to take effect as an
instrument under seal.

     IN WITNESS WHEREOF, Borrower has caused this Note to be duly executed,
sealed and delivered on the date first above written.

                                       HEI, INC.
                                       a Minnesota corporation

                                       -----------------------------------------
                                       By:  Steve E. Tondera
                                       Title:  CFO

                                       CROSS TECHNOLOGY, INC.
                                       a Minnesota corporation

                                       -----------------------------------------
                                       By:  Steve E. Tondera
                                       Title:  CFO

                                      E-4

<PAGE>

ACKNOWLEDGMENT OF SIGNATURE

STATE OF MINNESOTA          )
                            )  SS.
COUNTY OF HENNEPIN          )

     I, ______________________________, a Notary Public in and for the state and
county aforesaid, do hereby certify that before me this day personally appeared
Steve E. Tondera, the CFO of HEI, Inc., known to me to be the same person whose
name is subscribed to the foregoing Machinery & Equipment Note, and acknowledged
to me that he executed and delivered the foregoing Machinery & Equipment Note as
his free and voluntary act, for the uses set forth therein.

     IN WITNESS WHEREOF, I have hereunto set my hand and official seal this ____
day of _____________, 20__.

                                       -----------------------------------------
                                       Notary Public

                                       My Commission Expires:

                                       -----------------------------------------

STATE OF MINNESOTA          )
                            )  SS.
COUNTY OF HENNEPIN          )

     I, ______________________________, a Notary Public in and for the state and
county aforesaid, do hereby certify that before me this day personally appeared
Steve E. Tondera, the CFO of Cross Technology, Inc., known to me to be the same
person whose name is subscribed to the foregoing Machinery & Equipment Note, and
acknowledged to me that he executed and delivered the foregoing Machinery &
Equipment Note as his free and voluntary act, for the uses set forth therein.

     IN WITNESS WHEREOF, I have hereunto set my hand and official seal this ____
day of _____________, 20__.

                                       -----------------------------------------
                                       Notary Public

                                       My Commission Expires:

                                       -----------------------------------------

                                      E-5

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