Document:

<PAGE>

                                                                   EXHIBIT 10.61

                              FORTY-THIRD AMENDMENT

                                       TO

                    CONVERTIBLE DEBENTURE PURCHASE AGREEMENT

THIS FORTY-THIRD AMENDMENT TO CONVERTIBLE DEBENTURE PURCHASE AGREEMENT (the
"Amendment") is entered into as of December 27, 2002, by and between DISC, Inc.,
a California corporation (the "Company"), and MK GVD Fund (the "Purchaser").

R E C I T A L S:

A. WHEREAS on March 29, 1996 the Company and Purchaser entered into a
Convertible Debenture Purchase Agreement pursuant to which the Company agreed to
sell, and Purchaser agreed to purchase, an aggregate of $1,400,000 in principal
amount of Convertible Debentures, each convertible into shares of the Company's
Preferred Stock, which Agreement was amended as of December 31, 1996, April 11,
1997, December 31, 1997, March 27, 1998, June 30, 1998, September 25, 1998,
December 31, 1998, March 30, 1999, June 30, 1999, September 30, 1999, December
31, 1999, March 31, 2000, June 30,2000, September 30, 2000, December 29, 2000,
March 30, 2001, June29, 2001, September 28, 2001, December 31, 2001, March 6,
2002, March 15, 2002, March 19, 2002, March 26, 2002, March 27, 2002, April 4,
2002, April 12, 2002, April 24, 2002, April 26, 2002, May 3, 2002, June 10,
2002, June 27, 2002, June 28, 2002, August 1, 2002, August 6, 2002, August 19,
2002, September 11, 2002, September 20, 2002, September 27, 2002, September 30,
2002, October 31, 2002, November 5, 2002 and November 14, 2002 to increase the
aggregate amount of Convertible Debenture to be purchased thereunder to
$21,055,000.

B. The Company and Purchaser now seek to amend the Agreement to increase the
total amount of Convertible Debentures which Purchaser agrees to purchase
thereunder.

NOW, THEREFORE, for good and valuable consideration, receipt of which is hereby
acknowledged, and in consideration of the mutual covenants set forth herein, the
parties hereto agree as follows:

1. DEFINITIONS. Unless otherwise defined herein, capitalized terms used in the
Amendment shall have the same meanings ascribed to them in the Convertible
Debenture Purchase Agreement.

2. AMENDMENT TO CONVERTIBLE DEBENTURE PURCHASE AGREEMENT. Section 1.1(a) of the
Convertible Debenture Purchase Agreement is hereby amended to provide that
Purchaser agrees to purchase, and the Company agrees to issue and sell, an
aggregate of $21,705,000 in principal amount of Convertible Debentures, each in
the form and having the terms and conditions set forth in the amended Exhibit B
attached hereto.

3. ENTIRE AGREEMENT; AMENDMENT. The Convertible Debenture Purchase Agreement, as
amended by this Amendment, constitutes the full and complete agreement and
understanding between the parties hereto regarding the subject matter of the
Convertible Debenture Purchase Agreement and shall supersede all prior
communications, representations, understandings or agreements, if any, whether
oral or written, concerning the subject matter contained in the Convertible
Debenture Purchase Agreement, as so amended, and that no

<PAGE>

provision of the Convertible Debenture Purchase Agreement, as so amended, may be
modified, amended, waived or discharged, in whole or in part, except in
accordance with its terms.

4. FORCE AND EFFECT. Except as modified by this Amendment, the terms and
provisions of the Convertible Debenture Purchase Agreement are hereby ratified
and confirmed and are and shall remain in full force and effect. Should any
inconsistency arise between this Amendment and the Convertible Debenture
Purchase Agreement as to the specific matters which are the subject of this
Amendment, the terms and conditions of this Amendment shall control. This
Amendment shall be construed to be part of the Convertible Debenture Purchase
Agreement and shall be deemed incorporated into the Convertible Debenture
Purchase Agreement by this reference.

5. COUNTERPARTS. This Amendment may be executed in one or more counterparts,
each of which shall be an original but all of which together shall constitute
one instrument.

IN WITNESS WHEREOF, the Company has caused this Amendment to be executed in
duplicate on its behalf by its duly authorized officer and Purchaser has also
executed this Amendment in duplicate, all as of the day and year indicated
above.

                                   DISC, INC.

                            a California corporation

                    By: /s/ Henry Madrid
                        -------------------------------------
                        Henry Madrid
                        Chief Financial Officer

                                   PURCHASER:

                                   MK GVD FUND

                    By: /s/ Michael D. Kaufman
                        -------------------------------------
                        Michael D. Kaufman, General Partner<PAGE>

                                                                   EXHIBIT 10.62

                             FORTY-FOURTH AMENDMENT

                                       TO

                    CONVERTIBLE DEBENTURE PURCHASE AGREEMENT

THIS FORTY-FOURTH AMENDMENT TO CONVERTIBLE DEBENTURE PURCHASE AGREEMENT (the
"Amendment") is entered into as of December 31, 2002, by and between DISC, Inc.,
a California corporation (the "Company"), and MK GVD Fund (the "Purchaser").

R E C I T A L S:

A. WHEREAS on March 29, 1996 the Company and Purchaser entered into a
Convertible Debenture Purchase Agreement pursuant to which the Company agreed to
sell, and Purchaser agreed to purchase, an aggregate of $1,400,000 in principal
amount of Convertible Debentures, each convertible into shares of the Company's
Preferred Stock, which Agreement was amended as of December 31, 1996, April 11,
1997, December 31, 1997, March 27, 1998, June 30, 1998, September 25, 1998,
December 31, 1998, March 30, 1999, June 30, 1999, September 30, 1999, December
31, 1999, March 31, 2000, June 30,2000, September 30, 2000, December 29, 2000,
March 30, 2001, June29, 2001, September 28, 2001, December 31, 2001, March 6,
2002, March 15, 2002, March 19, 2002, March 26, 2002, March 27, 2002, April 4,
2002, April 12, 2002, April 24, 2002, April 26, 2002, May 3, 2002, June 10,
2002, June 27, 2002, June 28, 2002, August 1, 2002, August 6, 2002, August 19,
2002, September 11, 2002, September 20, 2002, September 27, 2002, September 30,
2002, October 31, 2002, November 5, 2002, November 14, 2002 and December 27,
2002 to increase the aggregate amount of Convertible Debenture to be purchased
thereunder to $21,705,000.

B. The Company and Purchaser now seek to amend the Agreement to increase the
total amount of Convertible Debentures which Purchaser agrees to purchase
thereunder.

NOW, THEREFORE, for good and valuable consideration, receipt of which is hereby
acknowledged, and in consideration of the mutual covenants set forth herein, the
parties hereto agree as follows:

1. DEFINITIONS. Unless otherwise defined herein, capitalized terms used in the
Amendment shall have the same meanings ascribed to them in the Convertible
Debenture Purchase Agreement.

2. AMENDMENT TO CONVERTIBLE DEBENTURE PURCHASE AGREEMENT. Section 1.1(a) of the
Convertible Debenture Purchase Agreement is hereby amended to provide that
Purchaser agrees to purchase, and the Company agrees to issue and sell, an
aggregate of $21,805,000 in principal amount of Convertible Debentures, each in
the form and having the terms and conditions set forth in the amended Exhibit B
attached hereto.

3. ENTIRE AGREEMENT; AMENDMENT. The Convertible Debenture Purchase Agreement, as
amended by this Amendment, constitutes the full and complete agreement and
understanding between the parties hereto regarding the subject matter of the
Convertible Debenture Purchase Agreement and shall supersede all prior
communications, representations, understandings or agreements, if any, whether
oral or written, concerning the subject matter contained in the Convertible
Debenture Purchase Agreement, as so amended, and that no

<PAGE>

provision of the Convertible Debenture Purchase Agreement, as so amended, may be
modified, amended, waived or discharged, in whole or in part, except in
accordance with its terms.

4. FORCE AND EFFECT. Except as modified by this Amendment, the terms and
provisions of the Convertible Debenture Purchase Agreement are hereby ratified
and confirmed and are and shall remain in full force and effect. Should any
inconsistency arise between this Amendment and the Convertible Debenture
Purchase Agreement as to the specific matters which are the subject of this
Amendment, the terms and conditions of this Amendment shall control. This
Amendment shall be construed to be part of the Convertible Debenture Purchase
Agreement and shall be deemed incorporated into the Convertible Debenture
Purchase Agreement by this reference.

5. COUNTERPARTS. This Amendment may be executed in one or more counterparts,
each of which shall be an original but all of which together shall constitute
one instrument.

IN WITNESS WHEREOF, the Company has caused this Amendment to be executed in
duplicate on its behalf by its duly authorized officer and Purchaser has also
executed this Amendment in duplicate, all as of the day and year indicated
above.

                                   DISC, INC.

                            a California corporation

                    By: /s/ Henry Madrid
                        -------------------------------------
                        Henry Madrid
                        Chief Financial Officer

                                   PURCHASER:

                                   MK GVD FUND

                    By: /s/ Michael D. Kaufman
                        -------------------------------------
                        Michael D. Kaufman, General Partner<PAGE>

      THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
      1933. THEY MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED, OR HYPOTHECATED IN
      THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN
      OPINION OF COUNSEL, REASONABLY SATISFACTORY TO THE COMPANY THAT SUCH
      REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933.

                                     WARRANT
                      TO PURCHASE SHARES OF COMMON STOCK OF
                                   FAFCO, INC.

      THIS CERTIFIES that, for value received ____________________________
("_______________"), is entitled, upon the terms and subject to the conditions
hereinafter set forth, to purchase from FAFCO, Inc., a California corporation
(the "Company"), that number of fully paid and nonassessable shares of the
Company's Common Stock at the purchase price per share as set forth in Section 1
below ("Exercise Price"). The number of shares and Exercise Price are subject to
adjustment as provided in Section 10 hereof.

      1.    Number of Shares; Exercise Price; Term.

      (a)   Subject to adjustments as provided herein, this Warrant is
exercisable at an Exercise Price of $0.125 per share.

      (b)   Subject to adjustment as provided below, this Warrant shall be
exercisable for up to _______ shares of the Company's Common Stock (the
"Shares").

      (c)   This Warrant shall be exercisable during the term commencing on the
date hereof and ending on the earliest of (i) the fifth anniversary of the
issuance date of this Warrant, (ii) the closing of a sale of all or
substantially all assets of the Company or a merger, consolidation or other
business combination transaction as a result of which the holders of capital
immediately prior to such transaction hold less than 50% of the aggregate voting
securities of the surviving entity (a "Change of Control Transaction").

      2.    Title to Warrant. This Warrant and all rights hereunder are
transferable, in whole or in part, but only with the prior written consent of
the Company. Transfers shall occur at the office or agency of the Company by the
holder hereof in person or by duly authorized attorney, upon surrender of this
Warrant together with the Assignment Form annexed hereto properly endorsed.

      3.    Exercise or Conversion of Warrant. (a) The purchase and conversion
rights represented by this Warrant are exercisable by the registered holder
hereof, in whole or in part, at any time, or from time to time, during the term
hereof as described in Section l above, by the surrender of this Warrant and the
Notice of Exercise and Investment Representation Statement annexed hereto duly
completed and executed on behalf of the holder hereof, at the office of the
Company in Chico, California (or such other office or agency of the Company as
it may designate by notice in writing to the registered holder hereof
<PAGE>
at the address of such holder appearing on the books of the Company), and
subject to Section 4 hereof, upon payment of the purchase price, the holder of
this Warrant shall be entitled to receive a certificate for the number of shares
so purchased and, if this Warrant is exercised in part, an amended Warrant for
the unexercised portion of this Warrant. (b) Notwithstanding any provisions
herein to the contrary, if the Fair Market Value (as hereinafter defined) is
greater than the Exercise Price (at the date of calculation, as set forth
below), in lieu of exercising this Warrant as hereinabove permitted, the Holder
may elect to convert this Warrant into shares of Common Stock equal to the value
(as determined below) of this Warrant by surrender of this Warrant for
conversion at the office of the Company referred to in paragraph (a) above,
together with the Notice of Exercise or Conversion, in which event the Company
shall issue to the Holder that number of shares of Common Stock computed using
the following formula:

                               CS = WCS x (FMV-EP)
                                    --------------
                                       FMV

Where

      CS    equals the number of shares of Common Stock to be issued to the
            Holder

      WCS   equals the number of shares of Common Stock purchasable under the
            Warrant

      FMV   equals the current fair market value of one share of Common Stock
            (at the date of such calculation)

      EP    equals the Exercise Price (as adjusted to the date of such
            calculation).

      For the purpose of any computation pursuant to this Section 3, the Fair
Market Value at any date of one share of Common Stock shall as determined in
good faith by the Board of Directors of the Company

            (c) The Company agrees that, upon exercise or conversion of this
      Warrant in accordance with the terms hereof, the shares so acquired shall
      be deemed to be issued to such holder as the record owner of such shares
      as of the close of business on the date on which this Warrant shall have
      been exercised. Certificates for shares purchased hereunder shall be
      issued by the Company promptly and in no event later than twenty-one (21)
      days after the date of exercise or conversion, and, on partial exercise or
      conversion of this Warrant, an amended Warrant for the unexercised or
      uncovered portion of this Warrant shall be delivered to the holder hereof
      as promptly as practicable after the date on which this Warrant shall have
      been exercised or conversion. All other terms and conditions of such
      amended Warrant shall be identical to those contained herein.

      The Company covenants that all shares which may be issued upon the
exercise or conversion of this Warrant will, upon exercise of the rights
represented by this Warrant or conversion of the aggregate Exercise Price, if
applicable be fully paid and nonassessable and free from all taxes, liens and
charges in respect of the issue thereof (other than taxes in respect of any
transfer occurring contemporaneously or otherwise specified herein).

                                      -2-
<PAGE>
      4.    No Fractional Shares or Scrip. No fractional shares or scrip
representing fractional shares shall be issued upon the exercise or conversion
of this Warrant. In lieu of any fractional share to which such holder would
otherwise be entitled, such holder shall be entitled, at its option, to receive
either (i) a cash payment equal to the excess of fair market value for such
fractional share above the Exercise Price for such fractional share (as mutually
determined by the Company and the holder) or (ii) a whole share if the holder
tenders the Exercise Price for one whole share.

      5.    Charges, Taxes and Expenses. Issuance of certificates for shares
upon the exercise or conversion of this Warrant shall be made without charge to
the holder hereof for any issue or transfer tax or other incidental expense in
respect of the issuance of such certificates, all of which taxes and expenses
shall be paid by the Company, and such certificates shall be issued in the name
of the holder of this Warrant or in such name or names as may be directed by the
holder of this Warrant (with the prior written consent of the Company);
provided, however, that in the event certificates for shares are to be issued in
a name other than the name of the holder of this Warrant, this Warrant when
surrendered for exercise or conversion shall be accompanied by the Assignment
Form attached hereto duly executed by the holder hereof and the Notice of
Exercise duly completed and executed and stating in whose name and certificates
are to be issued; and provided further, that such assignment shall be subject to
applicable laws and regulations. Upon any transfer involved in the issuance or
delivery of any certificates for shares of the Company's securities, the Company
may require, as a condition thereto, the payment of a sum sufficient to
reimburse it for any transfer tax incidental thereto.

      6.    No Rights as Shareholders. This Warrant does not entitle the holder
hereof to any voting rights, dividend rights or other rights as a shareholder of
the Company prior to the exercise hereof.

      7.    Exchange and Registry of Warrant. The Company shall maintain a
registry showing the name and address of the registered holder of this Warrant.
This Warrant may be surrendered for exchange, transfer or exercise, in
accordance with its terms, at the office of the Company, and the Company shall
be entitled to rely in all respects, prior to written notice to the contrary,
upon such registry.

      8.    Loss, Theft, Destruction or Mutilation of Warrant. Upon receipt by
the Company of evidence reasonably satisfactory to it of the loss, theft,
destruction or mutilation of this Warrant, and in case of loss, theft or
destruction, of indemnity or security reasonably satisfactory to it, and upon
reimbursement to the Company of all reasonable expenses incidental thereto, and
upon surrender and cancellation of this Warrant, if mutilated, the Company will
make and deliver a new Warrant of like tenor and dated as of such cancellation,
in lieu of this Warrant.

      9.    Saturdays, Sundays, Holidays, etc. If the last or appointed day for
the taking of any action or the expiration of any right required or granted
herein shall be a Saturday or a Sunday or shall be a legal holiday, then such
action may be taken or such right may be exercised on the next succeeding day
not a Saturday or a Sunday or a legal holiday.

      10.   Adjustments and Termination of Rights. The purchase price per share
and the number of shares purchasable hereunder are subject to adjustment from
time to time as follows:

                                      -3-
<PAGE>
            (a)   Merger. If at any time there shall be a merger or
consolidation of the Company with or into another corporation when the Company
is not the surviving corporation (other than a Change of Control Transaction
resulting in the expiration of this Warrant), then, as a part of such merger or
consolidation, lawful provision shall be made so that the holder of this Warrant
shall thereafter be entitled to receive upon exercise of this Warrant, during
the period specified herein and upon payment of the aggregate Exercise Price
then in effect, the number of shares of stock or other securities or property of
the successor corporation resulting from such merger or consolidation, to which
a holder of the stock deliverable upon exercise of this Warrant would have been
entitled in such merger or consolidation if this Warrant had been exercised
immediately before such merger or consolidation. In any such case, appropriate
adjustment shall be made in the application of the provisions of this Warrant
with respect to the rights and interests of the holder after the merger or
consolidation.

            (b)   Reclassification, etc. If the Company at any time shall, by
subdivision, combination or reclassification of securities or otherwise, change
any of the securities as to which purchase rights under this Warrant exist into
the same or a different number of securities of any other class or classes, this
Warrant shall thereafter represent the right to acquire such number and kind of
securities as would have been issuable as the result of such change with respect
to the securities which were subject to the purchase rights under this Warrant
immediately prior to such subdivision, combination, reclassification or other
change.

            (c)   Split, Subdivision or Combination of Shares. If the Company at
any time while this Warrant remains outstanding and unexpired shall split,
subdivide or combine the securities as to which purchase rights under this
Warrant exist, the Exercise Price shall be proportionately decreased in the case
of a split or subdivision or proportionately increased in the case of a
combination.

            (d)   Adjustment of Number of Shares. Upon each adjustment in the
Exercise Price pursuant to 10(c) above, the number of shares purchasable
hereunder shall be adjusted, to the nearest whole share, to the product obtained
by multiplying the number of shares purchasable immediately prior to such
adjustment in the Exercise Price by a fraction (i) the numerator of which shall
be the Exercise Price immediately prior to such adjustment, and (ii) the
denominator of which shall be the Exercise Price immediately after such
adjustment.

      11.   Notice of Adjustments; Notices. Whenever the Exercise Price or
number of shares purchasable hereunder shall be adjusted pursuant to Section 10
hereof, the Company shall issue a certificate signed by its an executive officer
of the Company setting forth, in reasonable detail, the event requiring the
adjustment, the amount of the adjustment, the method by which such adjustment
was calculated and the Exercise Price and number of shares purchasable hereunder
after giving effect to such adjustment, and shall cause a copy of such
certificate to be mailed (by first class mail, postage prepaid) to the holder of
this Warrant.

      12.   "Market Stand-off" Agreement. The Holder agrees, if requested by the
Company or an underwriter of such registered public offering, not to sell or
otherwise transfer or dispose of any Common Stock (or other securities) of the
Company held by such holder during a period of up to 90 days

                                      -4-
<PAGE>
following the effective date of any registration statement of the Company filed
under the Securities Act in connection with an underwritten offering of Common
Stock of the Company. Such agreement shall be in writing in the form
satisfactory to the Company and such underwriter, and may be included in the
underwriting agreement. The Company may impose stock-transfer instructions with
respect to the securities subject to the foregoing restriction until the end of
the required stand-off period.

      13.   Miscellaneous.

            (a)   Governing Law. This Warrant shall be binding upon any
successors or assigns of the Company. This Warrant shall constitute a contract
under the laws of California and for all purposes shall be construed in
accordance with and governed by the laws of said state, without giving effect to
the conflict of laws principles.

            (b)   Restrictions. THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933. THEY MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED, OR
HYPOTHECATED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT RELATED
THERETO OR AN OPINION OF COUNSEL, REASONABLY SATISFACTORY TO THE COMPANY THAT
SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933.

            (c)   Attorney's Fees. In any litigation, arbitration or court
proceeding between the Company and the holder relating hereto, the prevailing
party shall be entitled to reasonable attorneys' fees and expenses incurred in
enforcing this Warrant.

            (d)   Amendments. This Warrant may be amended and the observance of
any term of this Warrant may be waived only with the written consent of the
Company and the then holders of Warrants exercisable for a majority of the
shares of the Company's Common Stock then issuable upon exercise of all
outstanding unexercised Warrants sold pursuant to the Purchase Agreement.

            (e)   Notice. Any notice required or permitted hereunder shall be
deemed effectively given upon personal delivery to the party to be notified or
upon deposit with the United States Post Office, by certified mail, postage
prepaid and addressed to the party to be notified at the address indicated below
for such party, or at such other address as such other party may designate by
ten-day advance written notice.

                                      -5-
<PAGE>
      IN WITNESS WHEREOF, FAFCO, Inc. has caused this Warrant to be executed
by its officer thereunto duly authorized.

Dated:                     , 200
      --------------------      --

                                        FAFCO, INC.
                                        435 Otterson Drive
                                        Chico, California 95428-8207

                                        By:
                                           ---------------------------------
                                        Alex N. Watt, Chief Financial Officer

AGREED AND ACCEPTED:

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

------------------------------
Street Address

------------------------------
City,  State,   Zip Code

                                      -6-
<PAGE>
                               NOTICE OF EXERCISE

To:   FAFCO, Inc.

      1.    The undersigned hereby elects to purchase _______ shares of Common
Stock ("Stock") of FAFCO, Inc. (the "Company") pursuant to the terms of the
attached Warrant, and tenders herewith payment of the purchase price and any
transfer taxes payable pursuant to the terms of the Warrant, together with an
Investment Representation Statement in form attached.

      2.    The undersigned hereby elects to acquire ________ shares of Stock,
upon conversion of the attached Warrant pursuant to Section 3(b) thereof, and
hereby surrenders __________shares of Common Stock subject to the Warrant,
together with an Investment Representation Statement in form and substance
satisfactory to legal counsel to the Company.

                  [STRIKE PARAGRAPH ABOVE WHICH DOES NOT APPLY]

      3.    The shares of Stock to be received by the undersigned upon exercise
of the Warrant are being acquired for its own account, not as a nominee or
agent, and not with a view to resale or distribution of any part thereof, and
the undersigned has no present intention of selling, granting any participation
in, or otherwise distributing the same. The undersigned further represents that
it does not have any contract, undertaking, agreement or arrangement with any
person to sell, transfer or grant participation to such person or to any third
person, with respect to the Stock. The undersigned believes it has received all
the information it considers necessary or appropriate for deciding whether to
purchase the Stock.

      4.    The undersigned understands that the shares of Stock are
characterized as "restricted securities" under the federal securities laws
inasmuch as they are being acquired from the Company in transactions not
involving a public offering and that under such laws and applicable regulations
such securities may be resold without registration under the Securities Act of
1933, as amended (the "Act"), only in certain limited circumstances. In this
connection, the undersigned represents that it is familiar with SEC Rule 144, as
presently in effect, and understands the resale limitations imposed thereby and
by the Act.

      5.    The undersigned understands the instruments evidencing the Stock may
bear one or all of the following legends:

            (a)   "THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE
            SECURITIES ACT OF 1933. THEY MAY NOT BE SOLD, OFFERED FOR SALE,
            PLEDGED OR HYPOTHECATED IN THE ABSENCE OF A REGISTRATION STATEMENT
            IN EFFECT WITH RESPECT TO THE SECURITIES UNDER SUCH ACT OR AN
            OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT

                                      -7-
<PAGE>
            SUCH REGISTRATION IS NOT REQUIRED OR UNLESS SOLD PURSUANT TO RULE
            144 OF SUCH ACT."

            (b)   Any legend required by applicable state law.

      6.    Please issue a certificate or certificates representing said shares
            of Stock in the name of the undersigned:

                                        --------------------------
                                                 [Name]

      7.    Please issue a new Warrant for the unexercised portion of the
attached Warrant in the name of the undersigned:

                                        --------------------------
                                                 [Name]

            --------------------        --------------------------
            [Date]                               [Signature]

                                      -8-
<PAGE>
                                 ASSIGNMENT FORM

            (To assign the foregoing Warrant, execute this form and supply
            required information. Do not use this form to purchase shares.)

      FOR VALUE RECEIVED, the foregoing Warrant and all rights evidenced
thereby are hereby assigned to

------------------------------------------------------------
                                 (Please Print)

whose address is
                 -------------------------------------------
                                 (Please Print)

                                     Dated:                   , 200  .
                                           -----------------       --

          Holder's Signature:
                             -------------------------------

             Holder's Address:
                              ------------------------------

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

Signature Guaranteed:
                      --------------------------------

NOTE: The signature to this Assignment Form must correspond with the name as it
appears on the face of the Warrant, without alteration or enlargement or any
change whatever, and must be guaranteed by a bank or trust company. Officers of
corporations and those acting in a fiduciary or other representative capacity
should file proper evidence of authority to assign the foregoing Warrant.
<PAGE>
                       INVESTMENT REPRESENTATION STATEMENT

PURCHASER   :

COMPANY     :  FAFCO, Inc.

SECURITIES  :   Common Stock

DATE        :

      In connection with the purchase of the above-listed Securities, the
undersigned, the Purchaser represents to the Company the following:

            (a)   The undersigned is sufficiently aware of the Company's
business affairs and financial condition to reach an informed and knowledgeable
decision to acquire the Securities. The undersigned is purchasing these
Securities for its own account for investment purposes only and not with a view
to, or for the resale in connection with, any "distribution" thereof for
purposes of the Securities Act of 1933, as amended (the "Securities Act").

            (b)   The undersigned understands that the Securities have not been
registered under the Securities Act in reliance upon a specific exemption
therefrom, which exemption depends upon, among other things, the bona fide
nature of its investment intent as expressed herein. In this connection, the
undersigned understands that, in the view of the Securities and Exchange
Commission (the "SEC"), the statutory basis for such exemption may be
unavailable if its representation was predicated solely upon a present intention
to hold these Securities for the minimum capital gains period specified under
tax statutes, for a deferred sale, for or until an increase or decrease in the
market price of the Securities, or for a period of one year or any other fixed
period in the future.

            (c)   The undersigned further understands that the Securities must
be held indefinitely unless subsequently registered under the Securities Act or
unless an exemption from registration is otherwise available (such as Rule 144
under the Securities Act). Moreover, the undersigned understands that the
Company is under no obligation to register the Securities. In addition, the
undersigned understands that the certificate evidencing the Securities may be
imprinted with a legend which prohibits the transfer of the Securities unless
they are registered or such registration is not required in the opinion of
counsel for the Company.

            (d)   The undersigned is familiar with the provisions of Rule 144,
promulgated under the Securities Act, which, in substance, permits limited
public resale of "restricted securities" acquired, directly or indirectly, from
the issuer thereof (or from an affiliate of such issuer), in a non-public
offering subject to the satisfaction of certain conditions, including, among
other things: (1) The availability of certain public information about the
Company; (2) the resale occurring not less than one year after the party has
purchased, and made full payment for, within the meaning of Rule 144, the
securities to be sold; and, in the case of an affiliate, or of a non-affiliate
who has held the securities less than two years, (3) the sale being made through
a broker in an unsolicited "broker's transaction" or in transactions
<PAGE>
directly with a market maker, as said term is defined under the Securities
Exchange Act of 1934 (the "Exchange Act") and the amount of securities being
sold during any three month period not exceeding the specified limitations
stated therein, if applicable. There can be no assurances that the requirements
of Rule 144 will be met, or that the Securities will ever be saleable.

            (e)   The undersigned further understands that at the time the
undersigned wishes to sell the Securities there may be no public market upon
which to make such a sale, and that, even if such a public market then exists,
the Company may not be satisfying the current public information requirements of
Rule 144, and that, in such event, the undersigned would be precluded from
selling the Securities under Rule 144 even if the two-year minimum holding
period had been satisfied.

            (f)   The undersigned further understands that in the event all of
the applicable requirements of Rule 144 are not satisfied registration under the
Securities Act, compliance with Regulation A, compliance with some other
registration exemption or the notification to the Company of the proposed
disposition by it and the furnishing to the Company of (i) detailed information
regarding the disposition, and (ii) and opinion of its counsel to the effect
that such disposition will not require registration (the undersigned understands
such counsel's opinion shall concur with the opinion by counsel for the Company
and the undersigned shall have been informed of such compliance) will be
required and that, notwithstanding the fact that Rule 144 is not exclusive, the
Staff of the SEC has expressed its opinion that persons proposing to sell
private placement securities other than in a registered offering and otherwise
than pursuant to Rule 144 will have a substantial burden of proof in
establishing that an exemption from registration is available for such offers or
sales, and that such persons and their respective brokers who participate in
such transactions do so at their own risk.

                                        Signature of Purchaser:

                                        By:
                                           -----------------------------------

                                        Title:
                                              --------------------------

                                       -2-

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