EXHIBIT 10.8

AMENDMENT TO DEMAND LINE OF CREDIT AGREEMENT
AND DEMAND LINE OF CREDIT NOTE

THIS AMENDMENT, dated July ___, 2003, is to the Demand Line of Credit Agreement
between Zero Zone, Inc., ("Borrower") and U.S. Bank, N.A. ("Bank") dated August
30, 1999 (the "Credit Agreement") and the Demand Line of Credit Note executed by
Borrower in favor of Bank dated August 30, 1999 (the "Note").

WHEREAS, Borrower and Bank are entering into a Third Amendment to Direct Pay
Letter of Credit Application and Reimbursement Agreements (the "Third
Amendment") relating to the Reimbursement Agreements (as defined hereinafter);
and

WHEREAS, "Reimbursement Agreements" means the Direct Pay Letter of Credit
Application and Reimbursement Agreement between Bank and Borrower regarding the
$6,000,000 Zero Zone, Inc. Taxable Bonds, Series 1999 dated as of August 31,
1999, as amended by Amendment to Direct Pay Letter of Credit Application and
Reimbursement Agreements (the "First Amendment") dated as of January 31, 2002,
the Second Amendment to Direct Pay Letter of Credit Application and
Reimbursement Agreements (the "Second Amendment") dated February 5, 2003 and the
Third Amendment to Direct Pay Letter of Credit Application and Reimbursement
Agreement (the "Third Amendment") dated of even date with this Amendment (as
amended and as it may be amended from time to time, the "Taxable Bonds
Reimbursement Agreement") and the Direct Pay Letter of Credit Application and
Reimbursement Agreement between Bank and Borrower regarding the $3,420,000
Wisconsin Housing and Economic Development Authority Variable Rate Demand
Business Development Refunding Revenue Bonds, 1999 Series 2 (Zero Zone, Inc.
Project) dated as of August 31, 1999 as amended by the First Amendment, Second
Amendment and Third Amendment (as amended and as it may be amended from time to
time, and together with the Taxable Bonds Reimbursement Agreement, the
"Reimbursement Agreements"); and

WHEREAS, the parties hereto desire to amend the Credit Agreement and the Note.

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

1. Interest Rate Rider. The attached Interest Rate Rider shall be the
Interest Rate Rider for purposes of the Credit Agreement and the Note.

2. Cross Default. Without limitation of the demand feature of the Note,
the following shall be a default and an Event of Default under the Loan
Agreement and the Note: any default or Event of Default under either
Reimbursement Agreement or termination of either Reimbursement
Agreement.

3. Representations and Warranties. Borrower hereby represents and warrants
that all of the representations and warranties contained in any of the
Reimbursement Agreements, the Credit Agreement and the Notes are true
and correct in all material respects as of the date hereof.

4. Conditions Precedent. This Amendment shall not be effective until it
shall have been executed and delivered by the parties hereto and Bank
shall have received the following, fully executed if applicable and in
form and substance satisfactory to Bank:

a. Third Amendment to Direct Pay Letter of Credit Application and
Reimbursement Agreements;

b. Evidence of receipt by Borrower of proceeds of $1,500,000 in
subordinated loans;

c. Debt Subordination Agreement;

d. Officer's Certificate; and

e. Borrowing Resolutions.

5. Entire Agreement. This Amendment shall constitute the entire agreement
of the parties with respect to the subject matter hereof.

6. Applicable Law. This Amendment shall be governed by the laws of the
State of Wisconsin.

7. Fees and Expenses. The Borrower shall pay all fees and expenses of
Bank, including reasonable attorneys fees, arising out of or relating
to this Amendment, or otherwise relating to the transactions
contemplated hereby.

8. Effect of Amendment. The Credit Agreement and the Note shall remain in
full force and effect as amended hereby and by the attached Interest
Rate Rider.

ZERO ZONE, INC.

By: _____________________________
Jack Van Der Ploeg, President

U.S. Bank, N.A.

By: _____________________________
Caroline V. Krider,
Vice President and Senior Lender

INTEREST RATE RIDER

This Rider is made part of the Demand Line of Credit Note (the "Note") in the
original amount of $7,500,000.00 by Zero Zone, Inc. (the "Borrower") in favor of
U.S. Bank, N.A. (the "Bank"). The following interest rate description is hereby
added to the Note:

1. Interest Rate Options. Interest on each advance shall accrue at one of
the following per annum rates selected by Borrower (i) in the absence of
a LIBOR rate election, the prime rate announced by the Bank from time to
time, as and when such rate changes, less the Prime Rate Margin (the
rate so calculated is referred to herein as the "Floating Rate"), or
(ii) upon two (2) New York Banking Days notice by Borrower to Bank, the
LIBOR Rate Margin plus the 1, 2, 3 or 6 month LIBOR rate quoted by the
Bank (which shall be the LIBOR rate in effect two New York Banking Days
prior to commencement of the LIBOR loan advance, adjusted as the Bank
deems appropriate for any reserve requirement and any subsequent costs
arising form a change in government regulation, from Telerate Page 3750
or any successor thereto) (a "LIBOR Rate Loan"): If a LIBOR Rate Loan is
prepaid, whether by Borrower, as a result of acceleration, upon default
or otherwise, the Borrower agrees to pay all of the Bank's costs,
expenses and Interest Differential (as determined by the Bank) incurred
as a result of such prepayment. The term "Interest Differential" shall
mean that amount equal to the greater of zero dollars or the financial
loss incurred by the Bank resulting from prepayment, calculated as the
difference between an amount of interest the Bank would have earned
(from like investments in the Money Markets as of the first day of the
LIBOR Rate Loan) had prepayment not occurred and the interest the Bank
will actually earn (from like investments in the Money Market as of the
date of prepayment) as a result of the redeployment of funds from the
prepayment. Because of the short term nature of the facility, the
Borrower agrees that the Interest Differential shall not be discounted
to its present value. In the event the Borrower does not timely select
another interest rate option for a stated period after a LIBOR Rate Loan
expires, the Floating Rate shall apply. The Bank's internal records of
applicable interest rates shall be determinative in the absence of
manifest error. "New York Banking Day" means any day (other than a
Saturday or Sunday) on which commercial banks are open for business in
New York, New York.

2. Demand Facility. Notwithstanding the Bank's willingness and agreement to
provide LIBOR Rate Loan(s) to the Borrower, Borrower acknowledges that
this remains a demand facility and the Bank can demand payment of all of
the Obligations at any time, including all LIBOR Rate Loans that would
otherwise remain outstanding for their established term but for demand
for payment by the Bank.

3. Prime Rate Margin and LIBOR Rate Margin. The "Prime Rate Margin" and
"LIBOR Rate Margin" shall be determined based on Borrower's ratio of
Senior Funded Debt to EBITDA, as follows:

Ratio of Senior Funded Debt/
EBITDA Prime Rate Margin LIBOR Rate Margin
- ------- ----------------- -----------------
(subtract from Prime rate) (add to LIBOR Rate)

< 1.50 to 1.0 1.625% 1.25%
=>1.50 to 1.0 but < 2.00 to 1.0 1.375% 1.50%
=>2.00 to 1.0 but < 2.50 to 1.0 1.125% 1.75%
=>2.50 to 1.0 but < 3.00 x 1.0 .875% 2.00%
=>3.00 to 1.0 but < 3.50 to 1.0 .625% 2.25%
=>3.50 to 1.0 but < 4.00 to 1.0 .875% 2.00%
> 4.00 to 1.0 .625% 2.25%

4. EBITDA "EBITDA" shall have the meaning provided in the Taxable Bonds
Reimbursement Agreement.

5. Senior Funded Debt. "Senior Funded Debt" shall have the meaning provided
in the Taxable Bonds Reimbursement Agreement.

6. Adjustment of Interest Rate Margin Amounts. The ratio of Senior Funded
Debt to EBITDA shall be measured by Bank as of the last day of each
calendar quarter for the period of four calendar quarters ending on such
date and any changes to the LIBOR Rate Margin or Prime Rate Margin
provided for above shall be effective as follows as to all then
outstanding principal amounts:

a. for all outstanding Floating Rate Loans, on the first day of the
month subsequent to Bank's receipt of financial statements
evidencing a change in the ratio of Senior Funded Debt to EBITDA;
and

b. for all outstanding LIBOR Rate Loans on the first day after the
expiration of any interest period that is pending as of the date
Bank receives financial statements evidencing a change in the
ratio of Senior Funded Debt to EBITDA.

Notwithstanding the foregoing, in case of any increase in the Libor Rate
Margin or the Prime Rate Margin, such adjustment shall be retroactive,
if necessary, to be effective as of the first day of the month following
the date on which such financial statements were required to be
delivered to Bank under the Credit Agreement. Each time Borrower
delivers to Bank financial statements under which the ratio of Senior
Funded Debt to EBITDA should result in a change to the Prime Rate Margin
or the LIBOR Rate Margin, Borrower shall provide Bank with notice
showing Borrower's calculation of such ratio and indicating the new
Prime Rate Margin or LIBOR Rate Margin that should apply.

7. Calculation of Interest. Interest on Prime Rate Loans will be payable
monthly on the last day of each month on the basis of the actual number
of days elapsed in a year of 365 or 366 days, as applicable. Interest on
LIBOR Rate Loans will be payable on the last day of the period on which
the applicable LIBOR rate was determined, but for periods greater than
three months, interest shall paid on the last day of each third month of
such period and on the last day of such period. Interest on LIBOR Rate
Loans will be calculated on the basis of the actual number of days
elapsed in a year of 360 days.

8. Default Interest Rate. Principal amounts remaining unpaid after demand
for payment has been made or after a default or an Event of Default
shall bear interest from and after the date thereof until paid at a rate
of 2% per annum plus the rate otherwise payable.