Need window Balance weighted at 18 lb

A home owner from SAN DIEGO CA says:
Hi Jody in customer service said to send this info. I purchased item # S351-19 Option 1830 and it is not strong enough to hold window. The window weighs 18 lbs. What special order balance do I need? Thanks.
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Paul from SWISCO responded:
For 18 pounds, this balance will have to be custom made. Check out this Custom Channel Balance Request Form I've started for you based on your specifications and fill out the blank fields. One of our representatives will get back to you with a price quote and an item to add to your cart.
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