Document:

Exhibit 4.1

                                 AMENDMENT NO. 4
                                 ---------------

     This AMENDMENT No. 4 dated as of December 1, 2006 ("Amendment No.4"), is
entered into by and among DAYTON SUPERIOR CORPORATION, an Ohio corporation
("Borrower"), the persons designated as "Lenders" on the signature pages hereto,
and GENERAL ELECTRIC CAPITAL CORPORATION, a Delaware corporation, as Agent.

     WHEREAS, Borrower, the other Credit Parties, the Lenders (as defined
therein) and Agent are party to the Credit Agreement dated as of January 30,
2004, as amended by Amendment No. 1, dated June 30, 2004, Amendment No. 2, dated
February 23, 2005, and Amendment No. 3, dated September 29, 2006 ("Original
Credit Agreement"; all capitalized terms defined in the Original Credit
Agreement and not otherwise defined herein to have the meanings assigned thereto
in the Original Credit Agreement or in Annex A thereto); and

     WHEREAS, Borrower has requested that the Original Credit Agreement be
amended in the manner set forth below.

     NOW, THEREFORE, in consideration of the premises and the agreements,
provisions and covenants herein contained, Borrower, Credit Parties, the Lenders
and Agent agree as follows:

                                   SECTION 1.
                                   AMENDMENTS
                                   ----------

     Subject to the satisfaction of the conditions to effectiveness referred to
in Section 2 below, the Original Credit Agreement is hereby amended as follows:

     (a) Section 1.3(a) of the Original Credit Agreement is amended by replacing
the date "June 30, 2004" appearing therein with the date "December 1, 2006".

     (b) Annex A of the Original Credit Agreement is amended as follows:

          (i) The definition of "Borrowing Base" is amended by replacing the
dollar figure "$10,000,000" appearing in clause (f) thereof, with the dollar
figure "$15,000,000".

          (ii) The definition of "Change of Control" is amended and restated in
its entirety as follows:

          "Change of Control" means and includes:

          (a) prior to the consummation of an IPO, any of the following (i)
          Odyssey Investment Partners and its Related Parties cease to
          collectively beneficially own either (x) more than 50% of the voting
          power of the issued and outstanding shares of Stock of Borrower having
          the right to vote for the election of directors of Borrower under
          ordinary circumstances or (y) more than 50% of the voting power of the
          issued and outstanding shares of Stock of a corporation of which
          Borrower is a wholly owned Subsidiary having the right to vote for the
          election of directors of such corporation under ordinary
          circumstances; or (ii) the occurrence of a "Change of Control" (as
          defined in the Senior Notes Indenture) or a "Change of Control" (as
          defined in the Senior Subordinated Notes Indenture), and

<PAGE>

          (b) from and after the consummation of an IPO, any of the following
          (i) (x) any "person" or "group" (as such terms are used in Sections
          13(d) and 14(d) of the Securities Exchange Act of 1934, as amended
          (the "Exchange Act")), other than Odyssey Investment Partners, one or
          more of its Related Parties or a Permitted Group, shall become, or
          obtain rights (whether by means or warrants, options or otherwise) to
          become, the "beneficial owner" (as defined in Rules 13(d)-3 and
          13(d)-5 under the Exchange Act, except that such person or group shall
          be deemed to have beneficial ownership of all shares that any such
          person or group has the right to acquire, whether such right is
          exercisable immediately or only after the passage of time), directly
          or indirectly, of more than 35% of the voting power of the issued and
          outstanding shares of Stock of Borrower having the right to vote for
          the election of directors of Borrower under ordinary circumstances,
          and (y) Odyssey Investment Partners and its Related Parties and any
          Permitted Group collectively "beneficially own" (as defined above),
          directly or indirectly, in the aggregate a lesser percentage of the
          voting power of the issued and outstanding shares of Stock of Borrower
          having the right to vote for the election of directors of Borrower
          under ordinary circumstances and do not have the right or ability to
          designate for election a majority of the Board of Directors of
          Borrower; or (ii) the occurrence of a "Change of Control" (as defined
          in the Senior Notes Indenture) or a "Change of Control" (as defined in
          the Senior Subordinated Notes Indenture).

          (c) For the purposes of clause (b) of this definition, a person or
          group shall be deemed to beneficially own Stock in a person held by a
          parent entity if such person or group beneficially owns (as defined
          above) more than 50% of the issued and outstanding shares of Stock of
          such parent entity having the right to vote for the election of
          directors of such parent entity under ordinary circumstances.

          (iii) The definition of "Commitments" is amended by replacing the
phrase "ninety five million dollars ($95,000,000)" appearing therein with the
phrase "one hundred thirty million dollars ($130,000,000)".

          (iv) The definition of "Revolving Loan Commitment" is amended by
replacing the phrase "ninety five million dollars ($95,000,000)" appearing
therein with the phrase "one hundred thirty million dollars ($130,000,000)".

          (v) The definition of "Termination Date" is amended by replacing the
date "May 31, 2008" appearing therein with the date "July 31, 2008".

          (vi) The following definitions are added to Annex A in the appropriate
alphabetical places:

          "Amendment No. 3" means Amendment No. 3, dated as of September 29,
     2006, to this Agreement.

          "Amendment No. 4" means Amendment No. 4, dated as of December 1, 2006,
     to this Agreement.

                                       2
<PAGE>

          "Exchange Act" has the meaning ascribed to it in the definition of
     "Change of Control."

          "IPO" means an initial public offering of common Stock by Borrower
     pursuant to an effective registration statement under the Securities Act of
     1933, as amended, as a result of which at least 15% of Borrower's total
     issued and outstanding common Stock has been distributed.

          "Permitted Group" means any group of investors that is deemed to be a
     "person" (as that term is used in Section 13(d)(3) of the Exchange Act) by
     virtue of a Voting Agreement or any similar agreement, as the same may be
     amended, modified or supplemented from time to time; provided, however,
     that no single Person (other than Odyssey Investment Partners and its
     Related Parties) beneficially owns (together with its Affiliates) more of
     the voting power of the issued and outstanding shares of Stock of Borrower,
     having the right to vote for the election of directors of Borrower under
     ordinary circumstances, that is beneficially owned by such group of
     investors than is then collectively beneficially owned by Odyssey
     Investment Partners and its Related Parties in the aggregate.

          "Related Party" means:

          (1) any controlling stockholder, 50% (or more) owned Subsidiary, or
     immediate family member (in the case of an individual) of Odyssey
     Investment Partners; or

          (2) any trust, corporation, partnership, limited liability company or
     other entity, the beneficiaries, stockholders, partners, members, owners or
     Persons beneficially holding a 50% or more controlling interest of which
     consist of Odyssey Investment Partners and/or such other Persons referred
     to in the immediately preceding clause (1).

          "Voting Agreement" means any voting trust or similar agreement among
     current and/or former members of the management of Borrower and Odyssey
     Investment Partners and/or one or more of its Related Parties pursuant to
     which such current and/or former members of management grant Odyssey
     Investment Partners and/or its Related Parties the right to vote shares of
     Borrower's Stock.

          (vii) Annex B to the Original Credit Agreement is amended and restated
as set forth on Schedule A hereto.

                                   SECTION 2.
                           CONDITIONS TO EFFECTIVENESS
                           ---------------------------

     This Amendment No. 4 shall become effective on the date (the "Effective
Date") that the following conditions shall have been satisfied, so long as such
date is on or prior to December 31, 2006:

     (a) Agent shall have received one or more counterparts of this Amendment
No. 4 executed and delivered by Borrower, the other Credit Parties, Agent and
the Lenders.

                                       3
<PAGE>

     (b) Agent shall have received, in form and substance satisfactory to Agent,
such consents under and amendments or supplements to the Senior Notes Indenture
and Senior Subordinated Notes Indenture as may be necessary to permit the
execution, delivery and performance of this Amendment No. 4, and the incurrence
by Borrower of the maximum amount of Indebtedness contemplated by the Revolving
Loan Commitments (giving effect to this Amendment No. 4).

     (c) Agent shall have received such lien search reports as it may have
requested to reflect the continued perfection and priority of the security
interests of Agent in the Collateral.

     (d) Agent shall have received evidence, satisfactory to Agent, and as of a
date acceptable to Agent, of the good standing of Borrower and its qualification
in those jurisdictions in which the failure to qualify would have a Material
Adverse.

     (e) Agent shall have received a certificate of the secretary or an
assistant secretary of Borrower certifying the incumbency of the officer
executing this Amendment No. 4 and the corporate resolutions authorizing the
execution, delivery and performance of this Amendment No. 4, each in form and
substance satisfactory to Agent.

     (f) Agent shall have received a legal opinion, in form and substance
satisfactory to Agent, from Latham & Watkins LLP, as to such matters relative to
the authorization, execution and delivery o this Amendment No. 4, including,
without limitation, that the incurrence by Borrower of Revolving Loans to the
extent of the Revolving Loan Commitments, as increased by this Amendment No. 4,
is permitted under each of the Senior Notes Indenture and Senior Subordinated
Notes Indenture, as Agent shall have requested.

     (g) Agent shall have received that certain fee letter, dated as of December
1, 2006 between Borrower and Agent, in the form attached hereto as Exhibit A,
executed and delivered by Borrower and Agent and the payment in immediately
available funds of the fees payable on the Effective Date pursuant to such fee
letter.

     (h) On such date, there shall be no continuing Default or Event of Default
and the representations and warranties of Borrower contained in this Amendment
No. 4 shall be true and correct in all material respects.

                                   SECTION 3.
                               LIMITATION ON SCOPE
                               -------------------

     Except as expressly amended hereby, all of the representations, warranties,
terms, covenants and conditions of the Loan Documents shall remain in full force
and effect in accordance with their respective terms. The amendments set forth
herein shall be limited precisely as provided for herein and shall not be deemed
to be waivers of, amendments of, consents to or modifications of any term or
provision of the Loan Documents or any other document or instrument referred to
therein or of any transaction or further or future action on the part of
Borrower or any other Credit Party requiring the consent of Agent or Lenders
except to the extent specifically provided for herein. Agent and Lenders have
not and shall not be deemed to have waived any of their respective rights and
remedies against Borrower or any other Credit Party for any existing or future
Defaults or Event of Default.

                                       4
<PAGE>

                                   SECTION 4.
                                  MISCELLANEOUS
                                  -------------

     (a) Borrower hereby represents and warrants as follows:

          (i) this Amendment No. 4 has been duly authorized and executed by
Borrower, and the Original Credit Agreement, as amended by this Amendment No. 4,
is the legal, valid and binding obligation of Borrower, enforceable in
accordance with its terms, except as such enforceability may be limited by
applicable bankruptcy, moratorium and similar laws affecting the rights of
creditors in general; and

          (ii) Borrower repeats and restates the representations and warranties
of Borrower contained in the Original Credit Agreement as of the date of this
Amendment No. 4 and as of the Effective Date, except to the extent such
representations and warranties relate to a specific date.

     (b) This Amendment No. 4 is being delivered in the State of New York.

     (c) Borrower hereby ratifies and confirms the Original Credit Agreement as
amended hereby, and agrees that, as amended hereby, the Original Credit
Agreement remains in full force and effect.

     (d) Borrower agrees that all Loan Documents remains in full force and
effect notwithstanding the execution and delivery of this Amendment No. 4.

     (e) This Amendment No. 4 may be executed by the parties hereto in separate
counterparts, each of which when so executed and delivered shall be deemed an
original, but all of which counterparts together shall constitute but one and
the same instrument.

     (f) All references in the Loan Documents to the "Credit Agreement" and in
the Original Credit Agreement as amended hereby to "this Agreement," "hereof,"
"herein" or the like shall mean and refer to the Original Credit Agreement as
amended by this Amendment No. 4 (as well as by all subsequent amendments,
restatements, modifications and supplements thereto).

     (g) Each of the following provisions of the Original Credit Agreement is
hereby incorporated herein by this reference with the same effect as though set
forth in its entirety herein, mutatis mutandis, and as if "this Agreement" in
any such provision read "this Amendment No. 4": Section 9.3 (Notices), Section
9.6, (Severability), Section 9.8 (Headings), Section 9.9 (Applicable Law),
Section 9.12 (Construction), Section 9.15 (Waiver of Jury Trial) and Section
9.17 (Entire Agreement).

                            [signature pages follow]

                                       5
<PAGE>

     WITNESS the due execution hereof by the respective duly authorized officers
of the undersigned as of the date first written above.

                                       BORROWER:

                                       DAYTON SUPERIOR CORPORATION

                                       By: /s/ Edward J. Puisis
                                           --------------------
                                           Name: Edward J. Puisis
                                           Executive Vice President and Chief
                                           Financial Officer

                                       [signatures continue on the next page]

                                       6
<PAGE>

                                       AGENT AND LENDERS:

                                       GENERAL ELECTRIC CAPITAL CORPORATION,
                                       as Agent, an L/C Issuer and a Lender

                                       By: /s/ Daniel D. McCready
                                           ----------------------
                                           Name: Daniel D. McCready
                                           Title: Its Duly Authorized Signatory

                                       [signatures continue on the next page]

                                       7
<PAGE>

                                       GMAC COMMERCIAL FINANCE LLC,
                                       as a Lender

                                       By: /s/ Robert J. Brandow
                                           ---------------------
                                           Name: Robert J. Brandow
                                           Title: Director

                                       8
<PAGE>

                                   Schedule A
                                   ----------

                 ANNEX B (from Annex A - Commitments definition)
                                       to
                                CREDIT AGREEMENT

                     PRO RATA SHARES AND COMMITMENT AMOUNTS

                                                           Lender(s)
                                                           ---------
Revolving Loan Commitment
$65,000,000
(including a Swing Line Commitment
of $8,000,000)                              General Electric Capital Corporation

Revolving Loan Commitment
$65,000,000                                 GMAC Commercial Finance LLC

                                   Schedule A
<PAGE>

                                    Exhibit A
                                    ---------

                                    Exhibit AExhibit 4.2

                                                               Execution Version
================================================================================

                           DAYTON SUPERIOR CORPORATION
                     13% SENIOR SUBORDINATED NOTES DUE 2009

                          FIFTH SUPPLEMENTAL INDENTURE
                          DATED AS OF DECEMBER 4 , 2006

                    THE BANK OF NEW YORK TRUST COMPANY, N.A.
                                   AS TRUSTEE

================================================================================

                                       1
<PAGE>

     SUPPLEMENTAL INDENTURE, dated as of December 4, 2006 (this "Supplemental
Indenture"), between DAYTON SUPERIOR CORPORATION, an Ohio corporation (the
"Company"), and THE BANK OF NEW YORK TRUST COMPANY, N.A. a national banking
association duly organized under the laws of the United States, as successor
trustee (the "Trustee").

     WHEREAS, the Company and the Trustee are parties to an Indenture, dated as
of June 16, 2000 (as amended to date, the "Indenture"), pursuant to which the
Company issued its 13% Senior Subordinated Notes Due 2009 (the "Notes");

     WHEREAS, the Board of Directors of the Company has determined that it is in
the best interests of the Company to authorize and approve a proposed amendment
to a provision of the Indenture (the "Proposed Amendment");

     WHEREAS, Section 9.02 of the Indenture provides that the Company and the
Trustee may amend the Indenture and the Notes with the consent of the Holders of
at least a majority in principal amount of the Notes then outstanding;

     WHEREAS, the Company is soliciting consents pursuant to a supplement dated
November 30, 2006 (the "Supplement") to the Consent Solicitation Statement,
dated November 10, 2006 and the Consent Solicitation Statement, dated November
10, 2006 (collectively, the "Consent Solicitation Statement"), and accompanying
Consent Letter, from the Holders of the Notes in connection with the Proposed
Amendment as described in the Consent Solicitation Statement (the "Consent
Solicitation");

     WHEREAS, the Holders of at least a majority in principal amount of the
Notes have consented to the Proposed Amendment to a provision of the Indenture
in accordance with Section 9.02 of the Indenture and to the other provisions of
this Supplemental Indenture; and

     WHEREAS, the execution and delivery of this Supplemental Indenture have
been duly authorized and all conditions and requirements necessary to make this
Supplemental Indenture a valid and binding agreement have been duly performed
and complied with;

     NOW, THEREFORE, for and in consideration of the premises and other good and
valuable consideration, the receipt and sufficiency of which hereby are
acknowledged, it is mutually covenanted and agreed, for the equal proportionate
benefit of all Holders of the Notes, as follows:

                                   ARTICLE I.

                             AMENDMENT TO ARTICLE I

     Section 1.1 Paragraph (2) of the definition of "Permitted Indebtedness" in
Section 1.01 of the Indenture is hereby amended to read in its entirety as set
forth below:

                                       2
<PAGE>

          (2) Indebtedness of the Company or any of its Restricted Subsidiaries
          incurred pursuant to one or more Credit Facilities in an aggregate
          principal amount at any time outstanding pursuant to this clause (2)
          not to exceed the greater of $130.0 million or the Borrowing Base;
          provided that the amount of Indebtedness permitted to be incurred
          pursuant to Credit Facilities in accordance with this clause (2) shall
          be in addition to any Indebtedness permitted to be incurred pursuant
          to Credit Facilities in reliance on, and in accordance with, clauses
          (7), (13) and (15) below; and provided further that any Indebtedness
          outstanding under the Senior Credit Facility on the Issue Date shall
          initially be deemed to be incurred under this clause (2) and shall
          initially be the only Indebtedness deemed to have been incurred under
          this clause (2);

     Section 1.2 The following definition of "Borrowing Base" in is hereby added
to Section 1.01 of the Indenture:

          "Borrowing Base" means, as of any date, the sum of 75% of accounts
          receivable, net, and 60% of the sum of inventories and rental
          equipment, net (each as shown on the Company's most recently available
          consolidated balance sheet as of such date); provided that any
          accounts receivable, inventories or rental equipment that have been
          sold, conveyed or otherwise transferred to a Securitization Entity in
          connection with a Qualified Securitization Transaction shall not be
          included when calculating the Borrowing Base.

                                   ARTICLE II.

                               PAYMENT TO HOLDERS

     Section 2.1 The term "Qualifying IPO" means any one or more public
offerings pursuant to a registration statement on Form S-1 under the Securities
Act of 1933 of shares of the Company's common stock pursuant to which the
Company raises aggregate gross proceeds of at least $50.0 million.

     Section 2.2 Pursuant to the Consent Solicitation, the Company hereby agrees
to make a cash payment to each Holder of record as of 5:00 p.m. (New York City
time) on November 9, 2006 that delivered, and did not revoke, a duly executed
consent to the Proposed Amendment prior to 5:00 p.m. (New York City time), on
December 1, 2007, in the amount of $5.00 per $1,000 in outstanding principal
amount of Notes held by such Holder on November 9, 2006.

     Section 2.3 Pursuant to the Consent Solicitation, the Company hereby agrees
to make a cash payment to each Holder of record as of 5:00 p.m. (New York City
time) on May 1, 2007, if and only if the Company has not consummated a
Qualifying IPO prior to that date, in the amount of $2.50 per $1,000 in
outstanding principal amount of Notes held by such Holder on May 1, 2007.

     Section 2.4 Pursuant to the Consent Solicitation, the Company hereby agrees
to make a cash payment to each Holder of record as of 5:00 p.m. (New York City
time) on June 1, 2007, if and only if the Company has not consummated a
Qualifying IPO prior to that date, in the amount of $2.50 per $1,000 in
outstanding principal amount of Notes held by such Holder on June 1, 2007.

                                       3
<PAGE>

     Section 2.5 Payments, if any, pursuant to Sections 2.2, 2.3 and 2.4 shall
be made reasonably promptly after the dates referred to in such Sections.

                                  ARTICLE III.

                                  MISCELLANEOUS

     Section 3.1 The Trustee accepts the trusts created by the Indenture, as
amended and supplemented by this Supplemental Indenture, and agrees to perform
the same upon the terms and conditions of the Indenture, as amended and
supplemented by this Supplemental Indenture.

     Section 3.2 All capitalized terms used and not defined herein shall have
the respective meanings assigned to them in the Indenture.

     Section 3.3 Upon execution and delivery of this Supplemental Indenture, the
terms and conditions of this Supplemental Indenture shall be part of the terms
and conditions of the Indenture for any and all purposes, and all the terms and
conditions of both shall be read together as though they constitute one and the
same instrument, except that in case of conflict, the provisions of this
Supplemental Indenture will control.

     Section 3.4 Each of the Company and the Trustee hereby confirms and
reaffirms the Indenture in every particular except as amended and supplemented
by this Supplemental Indenture.

     Section 3.5 Notwithstanding an earlier execution date, the provisions of
this Supplemental Indenture shall not become operative until such time as the
Company notifies the Information Agent for the Consent Solicitation, Global
Bondholder Services Corporation, that each of the conditions set forth in the
Consent Solicitation Statement, including the absence of any law or regulation
that would, and the absence of any injunction or action or other proceeding
(pending or threatened) that could, in the Company's sole judgment, make
unlawful or invalid or enjoin the implementation of the Proposed Amendment or
that would, in the Company's sole judgment, question the legality or validity
thereof. The Company shall promptly notify the Trustee in writing that this
Supplemental Indenture has become operative.

     Section 3.6 All covenants and agreements in this Supplemental Indenture by
the Company or the Trustee shall bind their respective successors and assigns,
whether so expressed or not.

     Section 3.7 In case any provisions in this Supplemental Indenture 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.

                                       4
<PAGE>

     Section 3.8 Nothing in this Supplemental Indenture, express or implied,
shall give to any Person, other than the parties hereto and their successors
under the Indenture and the Holders of the Notes, any benefit or any legal or
equitable right, remedy or claim under the Indenture.

     Section 3.9 The parties may sign any number of copies of this Supplemental
Indenture. Each signed copy shall be an original, but all of them together shall
represent the same agreement. One signed copy is enough to prove this
Supplemental Indenture.

     Section 3.10 This Supplemental Indenture shall be governed by and construed
in accordance with the laws of the State of New York, as applied to contracts
made and performed within the State of New York, without regard to principles of
conflicts of law. Each of the parties hereto agrees to submit to the
jurisdiction of the courts of the State of New York in any action or proceeding
arising out of or relating to this Supplemental Indenture.

     Section 3.11 All provisions of this Supplemental Indenture shall be deemed
to be incorporated in, and made a part of, the Indenture; and the Indenture, as
amended and supplemented by this Supplemental Indenture, shall be read, taken
and construed as one and the same instrument.

     Section 3.12 The recitals contained herein shall be taken as the statements
of the Company, and the Trustee assumes no responsibility for their correctness.
The Trustee shall not be liable or responsible for the validity or sufficiency
of this Supplemental Indenture or the due authorization of this Supplemental
Indenture by the Company. In entering into this Supplemental Indenture, the
Trustee shall be entitled to the benefit of every provision of the Indenture
relating to the conduct of, affecting the liability of or affording protection
to the Trustee, whether or not elsewhere herein so provided.

                                       5
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed as of the date first written above.

                                       DAYTON SUPERIOR CORPORATION

                                       By: /s/ Edward J. Puisis
                                           --------------------
                                           Name:  Edward J. Puisis
                                           Title: Executive Vice President and
                                                  Chief Financial Officer

                                       THE BANK OF NEW YORK TRUST
                                       COMPANY, N.A., as Trustee

                                       By: /s/ Roxane Ellwanger
                                           --------------------
                                           Name:  Roxane Ellwanger
                                           Title: Assistant Vice President

                                       6

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