Document:

<PAGE>   1

                                                                    Exhibit 10.2

                                 AMENDMENT No. 6

                                       to

                   AMETEK 401(k) PLAN FOR ACQUIRED BUSINESSES

                  WHEREAS, there was adopted and made effective as of May 1,
1999, the AMETEK 401(k) Plan for Acquired Businesses (the "Acquired Businesses
Plan"); and

                  WHEREAS, Section 10.1 of the Plan provides that AMETEK, Inc.
("AMETEK") may amend the Plan at any time, and from time to time; and

                  WHEREAS, AMETEK now desires to amend the Plan in certain
respects;

                  NOW, THEREFORE, the Plan is hereby amended as follows:

         FIRST: Schedule I is hereby amended, to read in its entirety as
follows:

                                   "SCHEDULE I

<TABLE>
<CAPTION>
             Subsidiary/Division                                Employer Matching Contribution
             -------------------                                ------------------------------
<S>                                                             <C>
     Aerospace Division (Costa Mesa Plant)                                    4%
     AMETEK Patriot Sensors Division (Michigan)                               3%
     AMETEK Aerospace Patriot Products                                        3%
          (California)
     AMETEK Patriot Sensors Division (Pennsylvania)                           3%
     (known as Drexelbrook Controls, Inc. until merged into
     Patriot on 1/12/00)"
     AMETEK National Controls Corporation Retirement                          5%
           Savings Plan
     AMETEK Prestolite Power & Switch Division (Ohio)                         3%
     AMETEK Lamb Electric Division (Michigan Plant)                           3%
     AMETEK Lamb Electric Division (Oklahoma Plant)                           3%
     AMETEK Lamb Electric Division (Alabama Plant)                            3%
     Aerospace and Power Instruments Division (Rochester, NY)                 5%
</TABLE>

         SECOND: The provisions of this Amendment No. 6 shall be effective as of
October 1, 2000.

                                       1
<PAGE>   2
         IN WITNESS WHEREOF, AMETEK has caused these presents to be executed, in
its corporate name, by its duly authorized officer on this 12th day of
September, 2000.

                                                   AMETEK, Inc.

                                                   By: /s/ Donna F. Winquist
                                                      -----------------------

Attest:

 /s/ Kathryn E. Londra
----------------------------

                                       2<PAGE>   1
                                                                    Exhibit 10.3

                                 FIRST AMENDMENT
                         DATED AS OF SEPTEMBER 29, 2000
                                       TO
                           RECEIVABLES SALE AGREEMENT
                           DATED AS OF OCTOBER 1, 1999

         THIS AMENDMENT (the "Amendment"), dated as of September 29, 2000, is
entered into among Ametek Receivables Corp. (the "Seller"), Ametek, Inc. (the
"Initial Collection Agent"), Amsterdam Funding Corporation, a Delaware
corporation ("Amsterdam"), ABN AMRO Bank N.V., as Amsterdam's program letter of
credit provider (the "Enhancer"), the Liquidity Provider listed on the signature
page hereof (the "Liquidity Provider") and ABN AMRO Bank N.V., as agent for
Amsterdam, the Enhancer and the Liquidity Provider (the "Agent").

         Reference is hereby made to that certain Receivables Sale Agreement,
dated as of October 1, 1999 (as amended, supplemented or otherwise modified
through the date hereof, the "Sale Agreement"), among the Seller, the Initial
Collection Agent, Amsterdam, the Enhancer, the Liquidity Provider and the Agent.
Terms used herein and not otherwise defined herein which are defined in the Sale
Agreement or the other Transaction Documents (as defined in the Sale Agreement)
shall have the same meaning herein as defined therein.

         For good and valuable consideration, the receipt and adequacy of which
are hereby acknowledged, the parties hereto hereby agree as follows:

         Section 1. Subject to the following terms and conditions, including
without limitation the conditions precedent set forth in Section 2, upon
execution by the parties hereto in the space provided for that purpose below,
the Sale Agreement shall be, and it hereby is, amended as follows:

                  (a) The date "September 29, 2000" appearing in clause (d) of
         the defined term "Liquidity Termination Date" appearing in Schedule I
         of the Sale Agreement is deleted and replaced with the date "October
         31, 2000".

                  (b) The date "September 29, 2000" appearing in clause (c)(ii)
         of the defined term "Termination Date" appearing in Schedule I of the
         Sale Agreement is deleted and replaced with the date "October 31,
         2000".

         Section 2. Section 1 of this Agreement shall become effective only once
the Agent has received, in form and substance satisfactory to the Agent, all
documents and certificates as the Agent may reasonably request and all other
matters incident to the execution hereof are satisfactory to the Agent.

         Section 3. The Sale Agreement, as amended and supplemented hereby or as
contemplated herein, and all rights and powers created thereby and thereunder or
under the other Transaction Documents and all other documents executed in
connection therewith, are in all respects ratified and confirmed. From and after
the date hereof, the Sale Agreement shall be
<PAGE>   2
amended and supplemented as herein provided, and, except as so amended and
supplemented, the Sale Agreement, each of the other Transaction Documents and
all other documents executed in connection therewith shall remain in full force
and effect.

         Section 4. This Amendment may be executed in two or more counterparts,
each of which shall constitute an original but both or all of which, when taken
together, shall constitute but one instrument.

         Section 5. This Amendment shall be governed and construed in accordance
with the internal laws of the State of New York.

                                      -2-
<PAGE>   3
         IN WITNESS WHEREOF, the parties have caused this Amendment to be
executed and delivered by their duly authorized officers as of the date first
above written.

                                      ABN AMRO BANK N.V., as the Agent, as the
                                        Liquidity Provider and as the Enhancer

                                      By:  /s/ Thomas J. Educate
                                         ---------------------------
                                      Title:  Group Vice President
                                            ------------------------------

                                      By:  /s/ W. Robert Poff
                                         ---------------------------
                                      Title:  Group Vice President
                                            ------------------------------

                                      AMSTERDAM FUNDING CORPORATION

                                      By:   /s/ Andrew Stidd
                                         ---------------------------
                                      Title:  President
                                            ------------------------------

                                      AMETEK RECEIVABLES CORP., as Seller

                                      By:  /s/ Deirdre D. Saunders
                                         ---------------------------
                                      Title:  Vice President and Treasurer
                                            ------------------------------

                                      AMETEK, INC., as Initial Collection Agent

                                      By:  /s/ Deirdre D. Saunders
                                         ---------------------------
                                      Title:  Vice President and Treasurer
                                            ------------------------------

                                      -3-<PAGE>   1

                                                                    Exhibit 10.1

                                                                  EXECUTION COPY

                               AMENDMENT NO. 1 TO
                           REMARKETING AND CONTINGENT
                               PURCHASE AGREEMENT

         This AMENDMENT NO. 1 (the "AMENDMENT") is made as of November 7, 2000,
by and among Hercules Incorporated, a Delaware corporation ("HERCULES"),
Hercules Trust V, a Delaware statutory business trust (the "TRUST"), and Banc of
America Securities LLC (as remarketing agent, the "REMARKETING AGENT").
Capitalized terms used and not defined in this Amendment shall have the meanings
assigned to them in the Remarketing Agreement (as defined below).

                                   WITNESSETH:

         WHEREAS, Hercules, the Trust and the Remarketing Agent are parties to a
Remarketing and Contingent Purchase Agreement dated as of February 9, 2000 (the
"REMARKETING AGREEMENT");

         WHEREAS, the parties hereto desire to amend the Remarketing Agreement
to modify the timing and conditions relating to exercise of the Put Right and to
delete any reference to repayment of a portion of the Extension Fee;

         WHEREAS, the Remarketing Agreement provides for amendment of its
terms, subject to satisfaction of certain requirements;

         WHEREAS, all things necessary to make this Amendment a valid amendment
and agreement according to its terms have been done;

         NOW THEREFORE, in consideration of their mutual covenants contained
herein, the parties hereto, intending to be legally bound, hereby mutually
covenant and agree as follows:

                                    ARTICLE 1

         SECTION 1.01. Amendment of Section 8. Section 8 of the Remarketing
Agreement is hereby amended to read in its entirety as follows:

                  SECTION 8. Put Right. On any Business Day on or after 11:59
                  p.m. (New York City time) on November 15, 2000, the Holders of
                  a Majority in Liquidation Amount of the Trust Securities (or,
                  if applicable, the holders of a majority in principal amount
                  of the
<PAGE>   2
                  Subordinated Notes) may, by notice in writing to the Company
                  (the "PUT NOTICE"), require the Company to purchase from the
                  holders thereof, on a Pro Rata basis in accordance with
                  Section 9 of Annex I to the Trust Agreement, all outstanding
                  Trust Securities (or, if applicable, all outstanding
                  Subordinated Notes) for a purchase price equal to the
                  aggregate Liquidation Amount of such Trust Securities plus
                  accrued but unpaid Distributions thereon (or, if applicable,
                  the aggregate principal amount of such Subordinated Notes plus
                  accrued but unpaid interest thereon) (the "PUT RIGHT").
                  Payment of such purchase price shall be made directly to each
                  such holder on (A) the date on which the Put Notice is given,
                  if given before 11:00 a.m. New York City time or (B) the
                  Business Day immediately following the date on which the Put
                  Notice is given, if given after 11:00 a.m. New York City time.
                  Such purchase shall be without recourse of any kind to any
                  such holder. The parties recognize that the exercise of the
                  Put Right indicates that it would not be commercially
                  reasonable under the circumstances to require Holders of Trust
                  Securities (or, if applicable, holders of the Subordinated
                  Notes) to attempt to resell such securities otherwise than
                  pursuant to this Section 8, and that therefore in the event of
                  any default by the Company in its obligations under this
                  Section 8, a holder shall be entitled to recover the price of
                  the securities specified herein.

         SECTION 1.02.  Extension Fee.  Clause (b) of Section 25 of the
Remarketing Agreement is hereby deleted in its entirety.

         SECTION 1.03. Amendment Fee. In consideration for the execution of this
amendment, the Company agrees to pay to the Holders of the Preferred Securities
a fee as set forth in the Letter Agreement dated November 7, 2000 among Intrepid
Master Funding Trust, the Remarketing Agent and the Company.

         SECTION 1.04. Rescission of Remarketing Notice. Subject to the payment
of the fee referred to in Section 1.03 on the date hereof, the Remarketing Agent
hereby rescinds, and the Holders of a Majority in Liquidation Amount of the
Trust Securities hereby consent to the rescission of, the Remarketing Notice
given pursuant to the Remarketing Agreement on October 11, 2000.

         SECTION 1.05. Governing Law. This Amendment and the rights of the
parties hereunder shall be governed by and construed in accordance with the laws
of the State of New York and all rights and remedies shall be governed by such
laws, without reference to the choice of laws rules thereof.

                                        2
<PAGE>   3
         SECTION 1.06. Severability. If any provision in this Amendment shall be
invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions shall not in any way be affected or impaired thereby.

         SECTION 1.07. Counterparts. The parties may sign any number of copies
of this Amendment. Each signed copy shall be an original, but all of them
together represent the same agreement. Any signed copy shall be sufficient proof
of this Amendment.

                                        3
<PAGE>   4
         IN WITNESS WHEREOF, each of Hercules, the Trust and the Remarketing
Agent has caused this Remarketing Agreement to be executed in its name and on
its behalf by one of its duly authorized officers as of the date first above
written.

                                     HERCULES INCORPORATED

                                     By:
                                           -----------------------------------
                                           Name:
                                           Title:

                                     HERCULES TRUST V

                                     By:
                                           -----------------------------------
                                           Name:
                                           Title:

Confirmed and Accepted as of the date hereof:

BANC OF AMERICA
SECURITIES LLC, not individually,
  but solely as Remarketing Agent

By:
      -------------------------------
      Name:
      Title:

                                        4
<PAGE>   5
Consented to:

INTREPID FUNDING MASTER TRUST,
   as Holder of a Majority in Liquidation
   Amount of the Trust Securities
   By: Wilmington Trust Company,  not
          in its individual capacity, but
          solely as Owner Trustee

By:
    -------------------------
      Name:
      Title:

                                        5

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