Document:

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                                Exhibit 10(14)
         First Amendment to Business Loan Agreement between Registrant
           and Bank of America, Texas, N.A., dated February 12, 1997
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                                                                   EXHIBIT 10.14
[LOGO OF BANK OF AMERICA]

Mr. L.C. Martin
Aztec Manufacturing Co.
P.O. Box 668
Crowley, Texas

                         As of February 12, 1997

     Re:  Business Loan Agreement (Receivables and Inventory) between Bank of
          America, Texas, N.A. and Aztec Manufacturing Co. dated as of June 28,
          1996 (as the same has been or may be amended, the "Agreement"). All
                                                             ---------
          capitalized terms used herein, unless otherwise defined herein, shall
          have the same meaning as in the Agreement.

Dear Mr. Martin:

     This letter (the "Amendment Letter") is written to request that the
                       ----------------
Borrower agree to amend the Agreement as follows (the "Amendment"):
                                                       ---------

     1.  Section 8.2 of the Agreement will be amended by adding thereto a new
subsection 8.2(g) to read in its entirety as follows:

         (g)  With each of the financial statements required to be delivered to
     the Bank by the Borrower pursuant to this Section, a compliance certificate
     in substantially the form of Exhibit C hereto.

     2.  The Agreement will be amended by adding an Exhibit C thereto as set
forth in Attachment 1 to this Amendment Letter.

     If the Borrower agrees with the foregoing, please execute this Amendment
Letter in the space indicated below, have each of the Guarantors indicate their
consent to this Amendment Letter by providing their signature where indicated
and return a duplicate copy to the undersigned.

     Each of the Borrower and the Guarantors agrees that:

     a.  Except as expressly set forth herein, this Amendment Letter shall not
         be deemed to be an amendment or waiver of the terms and provisions of
         the Agreement or any
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         collateral document, security instrument, debt instrument or any other
         document or instrument executed in connection with the Agreement or in
         any way related thereto (all of such agreements, documents and
         instruments are referred to collectively herein as the "Loan
                                                                 ----
         Documents") nor a waiver of any default or event of default;
         ---------

     b.  Except as expressly modified by this Amendment Letter, the terms and
         provisions of the Loan Documents are ratified and confirmed and shall
         continue in full force and effect;

     c.  The Loan Documents continue to be legal, valid, binding and enforceable
         in accordance with their respective terms; and

     d.  Each reference in any Loan Document to the Agreement is hereby amended
         to mean the Agreement as amended by this Amendment Letter.

     THIS AMENDMENT LETTER EMBODIES THE FINAL, ENTIRE AGREEMENT AMONG THE
PARTIES HERETO AND SUPERSEDES ANY AND ALL PRIOR COMMITMENTS, AGREEMENTS,
REPRESENTATIONS AND UNDERSTANDINGS, WHETHER WRITTEN OR ORAL, RELATING TO THIS
AMENDMENT LETTER, AND MAY NOT BE CONTRADICTED OR VARIED BY EVIDENCE OF PRIOR,
CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS OR DISCUSSIONS OF THE PARTIES
HERETO. This Amendment Letter shall be governed by and construed in accordance
with the laws of the State of Texas and the applicable laws of the United States
of America. This Amendment Letter may be executed in one or more counterparts
and on telecopy counterparts each of which shall be deemed an original but all
of which together shall constitute one and the same agreement.

                                            Very truly yours.

                                            THE BANK:
                                            --------

                                            BANK OF AMERICA, TEXAS, N.A.

                                            By: /s/ Donald P. Hellman
                                                ---------------------------
                                                    Name: Donald P. Hellman
                                                          -----------------
                                                    Title: Vice President
                                                           --------------

Amendment Letter, Page 2<PAGE>

                                Exhibit 10(15)
        Second Amendment to Business Loan Agreement between Registrant
           and Bank of America, Texas, N.A., dated October 16, 1997
<PAGE>

                                                                   Exhibit 10.15

[LOGO BANK OF AMERICA]

                                                          Amendment to Documents
================================================================================
     SECOND AMENDMENT TO BUSINESS LOAN AGREEMENT (RECEIVABLES AND INVENTORY)

This Second Amendment to Business Loan Agreement (Receivables and Inventory) is
entered into as of September 22, 1997, between Bank of America Texas, N.A.
("Bank") and Aztec Manufacturing Co. ("Borrower").

                                   RECITALS
                                   --------

A.  WHEREAS, Bank and Borrower have entered into that certain Business Loan
Agreement (Receivables and Inventory) dated June 28, 1996, and amended on
February 12, 1997 (collectively the "Agreement"); and

B   WHEREAS, Borrower and Bank desire to amend certain terms and provisions of
said Agreement as more specifically hereinafter set forth.

                                    AGREED
                                    ------

NOW, THEREFORE, in consideration of the foregoing recitals and other valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
Bank and Borrower mutually agree to amend said Agreement as follows:

1.   Paragraph 2.5 (Letters of Credit) of the Agreement is amended and restated
     in its entirety to read as follows:

     2.5  Letters of Credit. This line of credit may be used for financing
     standby and/or commercial letters of credit with a maximum maturity not
     to exceed one year beyond the Expiration Date. The aggregate face
     amount of all letters of credit outstanding at any one time (including
     amounts drawn on letters of credit and not yet reimbursed) may not exceed
     Two Million and no/100 Dollars ($ 2,000,000,00).

          (a) any sum drawn under a letter of credit may, at the option of the
     Bank, be added to the principal amount outstanding under the line of credit
     pursuant to this Agreement. Such amount will bear interest and be due as
     described elsewhere in this Agreement;

          (b) if there is a default under this Agreement, to immediately
     prepay and make the Bank whole for any outstanding letters of credit:

          (c) the issuance of any letter of credit and any amendment to a letter
    of credit is subject to the Banks written approval and must be in form and
    content satisfactory to the Bank and in favor of a beneficiary.

          (d) to sign the Bank's form application and Agreement for Standby
     Letter of Credit in connection with and as a condition to the issuance of
     each letter of credit;

          (e) to pay any issuance and/or other fees that the Bank notifies the
          Borrower will be charged for issuing and processing letters of credit
          for the Borrower;

          (f) to allow the Bank to automatically charge its checking account for
          applicable fees, discounts, and other charges arising or accrued in
          respect of the Letters of Credit; and

          (g) to pay the Bank a non-refundable fee equal to 1% per annum of the
          outstanding undrawn amount of each standby letter of credit, payable
          quarterly in advance, calculated on the basis of the face amount
          outstanding on the day the fee is calculated.

                                                                               1
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 2.  Paragraph 8.22 (c), (iv) (Additional Negative Covenants) of the Agreement
     is amended and restated to read as follows:

     (iv)      the aggregate cash consideration paid in connection with all such
               transactions does not exceed Five Million Dollars
               ($5,000,000.00), from September 18, 1997 forward, for Borrower
               and the Guarantors in the aggregate during the entire term of
               this Agreement.

This Amendment will become effective as of the date first written above,
provided that each of the following conditions precedent have been satisfied in
a manner satisfactory to Bank:

     The Bank has received from the Borrower a duly executed original of this
     Amendment, together with a duly executed Guarantor Acknowledgment and
     Consent in the form attached hereto (the "Consent").

Except as provided in this Amendment, all of the terms and provisions of the
Agreement and the documents executed in connection therewith shall remain in
full force and effect. All references in such other documents to the Agreement
shall hereafter be deemed to be references to the Agreement as amended hereby.

THIS WRITTEN AMENDMENT AND THE DOCUMENTS EXECUTED IN CONNECTION HEREWITH
REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY
EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE
PARTIES.

I WITNESS WHEREOF, this Amendment has been executed by the parties hereto as of
the date first written above.

BANK OF AMERICA TEXAS, N.A.

                                          Aztec Manufacturing Co.

By: /s/ Donald Hellman
   ---------------------------
Donald Hellman, Vice President

                                          By: /s/ Dana Perry
                                              ------------------------------
                                          Dana Perry, Vice President/Finance

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