Document:

<PAGE>
                                                                   EXHIBIT 10(n)

                            THE LAMSON & SESSIONS CO.
      SEVENTH AMENDMENT AND WAIVER TO AMENDED AND RESTATED CREDIT AGREEMENT

         This Seventh Amendment and Waiver to Amended and Restated Credit
Agreement (herein, the "Amendment") is entered into as of February 16, 2005,
among The Lamson & Sessions Co., an Ohio corporation (the "Borrower"), the
Guarantors party hereto, the Lenders party hereto, and Harris Trust and Savings
Bank, as Administrative Agent for the Lenders.

                             PRELIMINARY STATEMENTS

         A. The Borrower, the Guarantors, the Lenders and the Administrative
Agent are parties to an Amended and Restated Credit Agreement dated as of
December 15, 2000 (the Amended and Restated Credit Agreement, as the same has
been amended prior to the date hereof, being referred to herein as the "Credit
Agreement"). All capitalized terms used herein without definition shall have the
same meanings herein as such terms have in the Credit Agreement.

         B. The Borrower has requested that the Lenders waive the Borrower's
non-compliance with Section 8.22 of the Credit Agreement (Total Funded
Debt/EBITDA Ratio) for the period ended December 31, 2004, and that certain
provisions of the Credit Agreement be amended, and the Lenders have agreed to do
so on the terms and conditions set forth in this Amendment.

         NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the parties hereto agree as
follows:

SECTION 1.    WAIVER.

         The Borrower has advised the Lenders that the Borrower was not in
compliance with Section 8.22 of the Credit Agreement (Total Funded Debt/EBITDA
Ratio) for the fiscal quarter ended December 31, 2004 (the "Existing Default").
The Borrower has requested that the Lenders waive the Existing Default and, by
signing below, the Required Lenders hereby agree to waive the Existing Default
through the period ended December 31, 2004, subject to the satisfaction of the
conditions precedent set forth in Section 3 below. This is a limited waiver for
the uses and purposes set forth above, and shall not apply to any subsequent
periods.

SECTION 2.    AMENDMENTS.

         Subject to the satisfaction of the conditions precedent set forth in
Section 3 below, the Credit Agreement shall be and hereby is amended as follows:

         2.1. Section 8.22 of the Credit Agreement (Total Funded Debt/EBITDA
Ratio) shall be amended and restated in its entirety to read as follows:

                 Section 8.22.    Total Funded Debt/EBITDA Ratio.  The Borrower
              shall not, as of the last day of each fiscal quarter of the

<PAGE>

              Borrower specified below, permit the Total Funded Debt/EBITDA
              Ratio to be more than:

                                                  TOTAL FUNDED DEBT/EBITDA RATIO
        FISCAL QUARTER ENDING ON OR ABOUT:            SHALL NOT BE MORE THAN:
                  March 31, 2005                            3.10 to 1.0
      June 30, 2005, and each fiscal quarter                2.75 to 1.0
                 ending thereafter

         1.2. Section 8.28 of the Credit Agreement (Level of Borrowings) shall
be amended and restated in its entirety to read as follows:

                           Section 8.28.    Intentionally deleted.

         1.3. In addition to the reporting required under Section 8.5 of the
Credit Agreement, the Borrower hereby agrees to deliver to the Administrative
Agent and the Lenders on or before April 30, 2005, a written plan the Borrower
intends to pursue in order to refinance the Obligations on or before the
Termination Date, which plan shall be in form and with such detail (including
timeline of events) as the Administrative Agent may reasonably require.

SECTION 2.    CONDITIONS PRECEDENT.

         The effectiveness of this Amendment is subject to the satisfaction of
all of the following conditions precedent:

         2.1. The Borrower, the Administrative Agent, and the Required Lenders
shall have executed and delivered this Amendment.

         2.2. The Guarantors shall have executed and delivered to the
Administrative Agent their consent to this Amendment in the space provided
below.

         2.3. The Borrower shall have paid to the Administrative Agent for
distribution to each Lender executing and delivering this Amendment on or before
February 16, 2005, a fee equal to 0.20% of the outstanding amount of each such
Lender's Revolving Credit Commitment and Term Loan.

         2.4. Legal matters incident to the execution and delivery of this
Amendment shall be satisfactory to the Administrative Agent and its counsel.

SECTION 3.    REPRESENTATIONS.

         In order to induce the Lenders to execute and deliver this Amendment,
the Borrower hereby represents to the Lenders that as of the date hereof, and
after giving effect to the waiver and amendments provided for in this Amendment,
(a) the representations and warranties set forth

                                      -2-
<PAGE>

in Section 6 of the Credit Agreement are and shall be and remain true and
correct (except that the representations contained in Section 6.5 shall be
deemed to refer to the most recent financial statements of the Borrower
delivered to the Lenders) and (b) the Borrower is in compliance with the terms
and conditions of the Credit Agreement and no Default or Event of Default exists
under the Credit Agreement or shall result after giving effect to this
Amendment.

SECTION 4.    MISCELLANEOUS.

         4.1. The Borrower and the Guarantors have heretofore or concurrently
herewith executed and delivered to the Lenders the Mortgages, the Security
Agreement, the Pledge Agreement, and certain other Collateral Documents. The
Borrower and, by signing below, the Guarantors, hereby acknowledge and agree
that the Liens created and provided for by the Collateral Documents continue to
secure, among other things, the Obligations arising under the Credit Agreement
as amended hereby; and the Collateral Documents and the rights and remedies of
the Lenders thereunder, the obligations of the Borrower and the Guarantors
thereunder, and the Liens created and provided for thereunder remain in full
force and effect and shall not be affected, impaired or discharged hereby.
Nothing herein contained shall in any manner affect or impair the priority of
the liens and security interests created and provided for by the Collateral
Documents as to the indebtedness which would be secured thereby prior to giving
effect to this Amendment.

         4.2. Except as specifically waived and amended herein, the Credit
Agreement shall continue in full force and effect in accordance with its
original terms. Reference to this specific Amendment need not be made in the
Credit Agreement, the Notes, or any other instrument or document executed in
connection therewith, or in any certificate, letter or communication issued or
made pursuant to or with respect to the Credit Agreement, any reference in any
of such items to the Credit Agreement being sufficient to refer to the Credit
Agreement as amended hereby.

         4.3. The Borrower agrees to pay on demand all reasonable costs and
expenses incurred by the Administrative Agent in connection with the
negotiation, preparation, execution and delivery of this Amendment, including
the reasonable fees and expenses of counsel for the Administrative Agent.

         4.4. This Amendment may be executed in any number of counterparts, and
by the different parties on different counterpart signature pages, all of which
taken together shall constitute one and the same agreement. Any of the parties
hereto may execute this Amendment by signing any such counterpart and each of
such counterparts shall for all purposes be deemed to be an original. This
Amendment shall be governed by the internal laws of the State of Illinois.

                           [SIGNATURE PAGE TO FOLLOW]

                                      -3-

<PAGE>

         This Seventh Amendment and Waiver to Amended and Restated Credit
Agreement is entered into as of the date and year first above written.

                            "BORROWER"

                            THE LAMSON & SESSIONS CO.

                            By /s/ James J. Abel
                               -------------------------------------------------
                               Name  James J. Abel
                                    --------------------------------------------
                               Title Exec. VP & CFO
                                    --------------------------------------------

                            "GUARANTORS"

                            CARLON CHIMES CO.

                            By /s/ James J. Abel
                               -------------------------------------------------
                               Name  James J. Abel
                                    --------------------------------------------
                               Title Vice President, Secretary & Treasurer
                                     -------------------------------------------

                            DIMANGO PRODUCTS CORPORATION

                            By /s/ James J. Abel
                               -------------------------------------------------
                               Name  James J. Abel
                                    --------------------------------------------
                               Title Secretary
                                    --------------------------------------------

                            PYRAMID INDUSTRIES II, INC.

                            By /s/ James J. Abel
                               -------------------------------------------------
                               Name  James J. Abel
                                    --------------------------------------------
                               Title Vice President & Treasurer
                                     -------------------------------------------

                                      -4-

<PAGE>

                            "LENDERS"

                            HARRIS TRUST AND SAVINGS BANK, in its individual
                               capacity as a Lender and as Administrative Agent

                            By /s/ Shahrokh Z. Shah
                               -------------------------------------------------
                               Name  Shahrokh Z. Shah
                                    --------------------------------------------
                               Title Managing Director
                                    --------------------------------------------

                            BANK OF AMERICA, N.A.

                            By /s/ Michael D. Hammond
                               -------------------------------------------------
                               Name  Michael Hammond
                                    --------------------------------------------
                               Title Senior Vice President
                                    --------------------------------------------

                            NATIONAL CITY BANK

                            By /s/ Judith M. Kuclo
                               -------------------------------------------------
                               Name  Judith M. Kuclo
                                    --------------------------------------------
                               Title Senior Vice President
                                    --------------------------------------------

                            THE PROVIDENT BANK

                            By /s/ Norman Lange
                               -------------------------------------------------
                               Name  Norman Lange
                                    --------------------------------------------
                               Title Vice President
                                    --------------------------------------------

                            JPMORGAN CHASE BANK, N.A. (formerly known as Bank
                               One, N.A.)

                            By /s/ Phil Duryen
                               -------------------------------------------------
                               Name  Phil Duryen
                                    --------------------------------------------
                               Title First Vice President
                                    --------------------------------------------

                                      -5-
<PAGE>
                            THE HUNTINGTON NATIONAL BANK

                            By /s/ Don W. Lambacher
                               -------------------------------------------------
                               Name  Don W. Lambacher
                                    --------------------------------------------
                               Title Senior Vice President
                                    --------------------------------------------

                            FIFTH THIRD BANK

                            By /s/ Roy C. Lanctot
                               -------------------------------------------------
                               Name  Roy C. Lanctot
                                    --------------------------------------------
                               Title Vice President
                                    --------------------------------------------

                            KEYBANK NATIONAL ASSOCIATION

                            By /s/ Leslie A. Jones
                               -------------------------------------------------
                               Name  Leslie A. Jones
                                    --------------------------------------------
                               Title Vice President
                                    --------------------------------------------

                            LASALLE BANK NATIONAL ASSOCIATION

                            By /s/ Robert M. Walker
                               -------------------------------------------------
                               Name   Robert M. Walker
                                    --------------------------------------------
                               Title  Vice President
                                    --------------------------------------------

                                      -6-<PAGE>
                                                                   EXHIBIT 10(q)

                            THE LAMSON & SESSIONS CO.
                            SUPPLEMENTAL PENSION PLAN

         WHEREAS, The Lamson & Sessions Co. (the "Company") has established the
Lamson & Sessions Co. Salaried Employees' Retirement Plan (the "Pension Plan"),
a qualified defined benefit pension plan; and

         WHEREAS, Sections 401(a)(17) and 415 of the Internal Revenue Code of
1986, as amended, place certain limitations on the amount of benefits that would
otherwise be made available under the Pension Plan for certain participants; and

         WHEREAS, the Company now desires to provide the benefits which would
otherwise have been payable to such participants under the Pension Plan except
for such limitations, in consideration of services performed and to be performed
by such participants for the Company and certain related corporations.

         NOW, THEREFORE, the Company hereby adopts and publishes this
Supplemental Pension Plan, which shall contain the following terms and
conditions:

                                    ARTICLE I
                                     PREFACE

         SECTION 1.1. Effective Date. The effective date of this Plan is
February 23, 2000.

         SECTION 1.2. Purpose of the Plan. The purpose of this Plan is to
provide additional retirement benefits for certain management and highly
compensated employees of the Company.

         SECTION 1.3. Governing Law. This Plan shall be regulated, construed and
administered under the laws of the State of Ohio, except when preempted by
federal law.

         SECTION 1.4. Gender and Number. For purposes of interpreting the
provisions of this Plan, the masculine gender shall be deemed to include the
feminine, the feminine gender shall be deemed to include the masculine, and the
singular shall include the plural, unless otherwise clearly required by the
context.

         SECTION 1.5. Severability. If any provision of this Plan or the
application thereof to any circumstance(s) or person(s) is held to be invalid
by a court of competent jurisdiction, the remainder of the Plan and the
application of such provision to other circumstances or persons shall not be
affected thereby.

                                   ARTICLE II
                                   DEFINITIONS

         SECTION 2.1. Words and phrases used herein with initial capital letters
which are defined in the Pension Plan are used herein as so defined, unless
otherwise specifically defined herein or the context clearly indicates
otherwise. The following words and phrases when used in this Plan with initial
capital letters shall have the following respective meanings, unless the context
clearly indicates otherwise:

<PAGE>

         SECTION 2.1(1). "Actual Pension Plan Benefit" shall mean the amount of
the monthly benefit in fact payable to the Participant or his Beneficiary under
the Pension Plan.

         SECTION 2.1(2). "Beneficiary".

         (a) In General. The term "Beneficiary" shall mean the person who is
entitled to receive part or all of a pension or other benefit payable with
respect to the Participant under the Pension Plan.

         (b) Change of Beneficiaries. Notwithstanding the foregoing, each
Participant may at any time and from time to time, before and after retirement,
change his Beneficiary hereunder without the consent of any existing Beneficiary
or any other person. Therefore, the Beneficiary under the Plan need not be the
same as the Beneficiary under the Pension Plan. However, as described in
Subsection (c) of this Section, the Beneficiary under the Pension Plan shall be
used as the "measuring life" for purposes of the amount and duration of the
Supplemental Pension Benefits payable to any Beneficiary hereunder. The change
of a Beneficiary under the Plan may be made, and may be revoked, only by an
instrument (in form acceptable to the Company) signed by the Participant and
filed with the Secretary of the Company prior to the Participant's death. If two
or more persons designated as a Participant's Beneficiary are in existence, the
amount of any payment to the Beneficiary under this Plan shall be divided
equally among such persons unless the Participant's designation specifically
provided to the contrary.

         (c) Effect of Change of Beneficiary. Supplemental Pension Benefits
shall be payable to a Beneficiary hereunder only so long as Actual Pension Plan
Benefits are being paid to the Beneficiary under the Pension Plan. In the event
that the Beneficiary hereunder is different than the Beneficiary under the
Pension Plan, (i) if the Beneficiary hereunder dies after the Participant but
while the Beneficiary under the Pension Plan is still living, any remaining
payments hereunder shall be payable, as they come due, to the estate of the
Beneficiary hereunder or, if applicable, to the contingent Beneficiary
designated hereunder by the Participant, (ii) if the Beneficiary hereunder
predeceases the Beneficiary under the Pension Plan and the Participant, the
Beneficiary hereunder shall revert to the Beneficiary last effectively
designated under the Pension Plan unless and until the Participant again makes a
change of Beneficiary pursuant to paragraph (b) above, and (iii) if the
Beneficiary under the Pension Plan predeceases the Beneficiary hereunder,
Supplemental Pension Payments hereunder shall cease.

         SECTION 2.1(3). "Code" shall mean the Internal Revenue Code of 1986, as
it has been and may be amended from time to time.

         SECTION 2.1(4). "Code Limitations" shall mean the limitations imposed
by Sections 401(a)(17) and 415 of the Code, or any successor(s) thereto, on the
amount of the benefits which may be payable to a Participant from the Pension
Plan.

         SECTION 2.1(5). "Instrument Designating Participants" shall mean the
Instrument referred to in Section 5.4 by which the Company, among other things,
evidences its designation of Participants in the Plan.

                                       2
<PAGE>

         SECTION 2.1(6). "Participant" shall mean each Employee of the Company
(a) who is either a highly compensated or a management employee, (b) who is a
participant in the Pension Plan, (c) who is designated by the Compensation
Committee of the Board of Directors of the Company as a Participant in this Plan
and (d) who as a result of participation in this Plan is entitled to a
Supplemental Pension Benefit under this Plan. Each person who is so designated
as a Participant under this Plan shall be notified in writing of such fact by
the Company. Once an Employee has been designated as a Participant, he shall
remain a Participant unless and until the Compensation Committee of the Board of
Directors of the Company revokes his Participant status. Upon the revocation of
Participant status, a former Participant shall remain as an inactive Participant
until all vested Supplemental Pension Benefits have been paid to him or his
Beneficiary; provided, however, that the Supplemental Pension Benefit payable to
an inactive Participant shall never exceed the monthly benefit determined as of
the date his status as a Participant in this Plan was revoked.

         SECTION 2.1(7). "Pension Plan" shall mean the Lamson & Sessions Co.
Salaried Employees' Pension Plan, as such plan may be amended from time to time.

         SECTION 2.1(8). "Plan" shall mean this Lamson & Sessions Co.
Supplemental Pension Plan, as it may be amended from time to time.

         SECTION 2.1(9). "Supplemental Pension Benefit" shall mean the
retirement benefit determined under Section 3.1.

                                   ARTICLE III
                          SUPPLEMENTAL PENSION BENEFIT

         SECTION 3.1. Amount of Supplemental Pension Benefit. Each Participant
or Beneficiary of a deceased Participant whose benefits under the Pension Plan
payable on or after the Effective Date are reduced due to the Code Limitations
shall be entitled to a Supplemental Pension Benefit, which shall be determined
as hereinafter provided. The Supplemental Pension Benefit shall be a monthly
retirement benefit equal to the difference between (a) the amount of the monthly
benefit payable to the Participant or his Beneficiary under the Pension Plan,
determined under the Pension Plan as in effect on the date of the Participant's
termination of employment with the Controlled Group (and payable in the same
optional form as his Actual Pension Plan Benefit) but calculated as if the
Pension Plan did not contain the Code Limitations and (b) the amount of the
Actual Pension Plan Benefit.

         SECTION 3.2. Time of Payment. A Participant's (or Beneficiary's)
Supplemental Pension Benefit shall commence at the same time and under the same
conditions as the benefits payable to the Participant (or Beneficiary) under the
Pension Plan.

         SECTION 3.3. Form of Payment. The Supplemental Pension Benefit shall be
payable in the same form and for the same duration as the benefits payable to
the Participant (or Beneficiary) under the Pension Plan.

                                   ARTICLE IV
                                     VESTING

         SECTION 4.1. Vesting. A Participant shall be vested in his Supplemental
Pension Plan Benefit in accordance with the vesting provisions of the Pension
Plan.

                                       3
<PAGE>

                                    ARTICLE V
                                  MISCELLANEOUS

         SECTION 5.1. Limitation on Rights of Participants and Beneficiaries -
No Lien. This Plan is an unfunded, nonqualified plan and the entire cost of this
Plan shall be paid from the general assets of the Company. No trust has been
established for the Participants or Beneficiaries. No liability for the payment
of benefits under the Plan shall be imposed upon any officer, director,
employee, or stockholder of the Company. Nothing contained herein shall be
deemed to create a lien in favor of any Participant or Beneficiary on any assets
of the Company. The Company shall have no obligation to purchase any assets that
do not remain subject to the claims of the creditors of the Company for use in
connection with the Plan. Each Participant and Beneficiary shall have the status
of a general unsecured creditor of the Company and shall have no right to, prior
claim to, or security interest in, any assets of the Company.

         SECTION 5.2. Nonalienation. No right or interest of a Participant or
his Beneficiary under this Plan shall be anticipated, assigned (either at law or
in equity) or alienated by the Participant or his Beneficiary, nor shall any
such right or interest be subject to attachment, garnishment, levy, execution or
other legal or equitable process or in any manner be liable for or subject to
the debts of any Participant or Beneficiary. If any Participant or Beneficiary
shall attempt to or shall alienate, sell, transfer, assign, pledge or otherwise
encumber his benefits under the Plan or any part thereof, or if by reason of his
bankruptcy or other event happening at any time such benefits would devolve upon
anyone else or would not be enjoyed by him, then the Company may terminate his
interest in any such benefit and hold or apply it to or for his benefit or the
benefit of his spouse, children or other person or persons in fact dependent
upon him, or any of them, in such a manner as the Company may deem proper;
provided, however, that the provisions of this sentence shall not be applicable
to the surviving spouse of any deceased Participant if the Company consents to
such inapplicability, which consent shall not unreasonably be withheld.

         SECTION 5.3. Employment Rights. Employment rights shall not be enlarged
or affected hereby. The Company shall continue to have the right to discharge a
Participant, with or without cause.

         SECTION 5.4. Instrument Designating Participants. The Compensation
Committee of the Board of Directors of the Company shall designate which
Employees of the Company who meet the requirements of clauses (a) and (b) of
Section 2.1(6) are to be Participants in the Plan and shall designate such
Participants in an Instrument Designating Participants.

         SECTION 5.5. Administration of Plan.

         (a) The Company shall be responsible for the general administration of
the Plan and for carrying out the provisions hereof and, for purposes of the
Employee Retirement Income Security Act of 1974, as amended, the Company shall
be the plan sponsor and the plan administrator. The Compensation Committee of
the Board of Directors of the Company shall interpret where necessary, in its
reasonable and good faith judgment, the provisions of the Plan and, except as
otherwise provided in the Plan, shall determine the rights and status of
Participants and Beneficiaries hereunder (including, without limitation, the
amount of any Supplemental Pension Benefit to which a Participant or Beneficiary
may be entitled under the Plan).

         (b) The Compensation Committee of the Board of Directors of the Company
and the Company each may, from time to time, delegate all or part of the
administrative powers, duties and authorities delegated to it under this Plan to
such person or persons, office or committee as it shall select.

                                       4
<PAGE>

         SECTION 5.6. Claims Procedure. Whenever there is denied, whether in
whole or in part, a claim for benefits under the Plan filed by any person
(herein referred to as the "Claimant"), the plan administrator shall transmit a
written notice of such decision to the Claimant, which notice shall be written
in a manner calculated to be understood by the Claimant and shall contain a
statement of the specific reasons for the denial of the claim and a statement
advising the Claimant that, within 60 days of the date on which he receives such
notice, he may obtain review of such decision in accordance with the procedures
hereinafter set forth. Within such 60-day period, the Claimant or his authorized
representative may request that the claim denial be reviewed by filing with the
plan administrator a written request therefor, which request shall contain the
following information:

         (a)  the specific portions of the denial of his claim which the
     Claimant requests the plan administrator to review;

         (b)  a statement by the Claimant setting forth the basis upon which he
     believes the plan administrator should reverse the previous denial of his
     claim for benefits and accept his claim as made; and

         (c)  any written material which the Claimant desires the plan
     administrator to examine in its consideration of the Claimant's position as
     stated pursuant to Subsection (b) above.

         Within 60 days of the date the Claimant files the written request for
review, the plan administrator shall designate a named fiduciary to conduct a
full and fair review of the decision denying the Claimant's claim for benefits.
Within 60 days of the date of such review, the named fiduciary shall render its
written decision on review, written in a manner calculated to be understood by
the Claimant, specifying the reasons and Plan provisions upon which its decision
was based.

         SECTION 5.7. Effect on other Benefits. Benefits payable to or with
respect to a Participant under the Pension Plan or any other Company sponsored
(qualified or nonqualified) plan, if any, are in addition to those provided
under this Plan.

         SECTION 5.8. Payment to Guardian. If a benefit payable hereunder is
payable to a minor, to a person declared incompetent or to a person incapable of
handling the disposition of his property, the Company may direct payment of such
benefit to the guardian, legal representative or person having the care and
custody of such minor, incompetent or person. The Company may require such proof
of incompetency, minority, incapacity or guardianship as it may deem appropriate
prior to distribution of the benefit. Such distribution shall completely
discharge the Company from all liability with respect to such benefit.

                                   ARTICLE VI
                            AMENDMENT AND TERMINATION

         SECTION 6.1. Amendment. The Board of Directors of the Company does
hereby reserve the right to amend, at any time, any or all of the provisions of
the Plan, without the consent of any Participant, Beneficiary or any other
person. Any such amendment shall be expressed in an instrument executed by an
authorized officer of the Company and shall become effective as of the date
designated in such instrument or, if no such date is specified, on the date of
its execution.

         SECTION 6.2. Termination. (a) The Board of Directors of the Company
does hereby reserve the right to terminate the Plan at any time, without the
consent of any Participant, Beneficiary or any other person. Such termination
shall be expressed in an instrument executed by

                                       5
<PAGE>

an authorized officer of the Company and shall become effective as of the date
designated in such instrument, or if no date is specified, on the date of its
execution.

         (b) Upon any termination of the Plan, each affected Participant's
Supplemental Pension Benefit shall be determined and distributed to him (or his
Beneficiary) as otherwise provided in Article III, treating the date of
termination as the date of each Participant's termination of employment,
provided that the Compensation Committee of the Board of Directors of the
Company may direct that benefits accrued to the date of such termination be
paid, as soon as reasonably practicable following the termination, to each
Participant (or in the case of a deceased Participant, the Beneficiary of such
Participant) in a single lump sum payment that is the actuarial equivalent of
the benefits otherwise payable to the Participant or Beneficiary, such actuarial
equivalence to be determined pursuant to the procedures employed for such
purposes under the Pension Plan at the date of termination.

         SECTION 6.3. Limitations on Amendment and Termination. Notwithstanding
the foregoing provisions of this Article, no amendment or termination of the
Plan shall, without the consent of the Participant (or, in the case of the
Participant's death, the Participant's Beneficiary), adversely affect the vested
Supplemental Pension Benefit under the Plan of any Participant or Beneficiary as
such Benefit exists on the date of such amendment or termination.

         IN WITNESS WHEREOF, The Lamson & Sessions Co. has executed this
Supplemental Pension Plan this 18th day of February, 2003.

                                            THE LAMSON & SESSIONS CO.

                                                   /s/ John B. Schulze
                                            ------------------------------------
                                                       John B. Schulze
                                            Chairman and Chief Executive Officer

                                       6

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