block and tackle balances

A contractor from Chicago, IL says:
August 30, 2023
I have block and tackle balances stamped with "BSI" and 32HT on the top sash, and 32HB on the bottom sash. i can always get more pictures but this is all i have for now. can you help me figure out if these can be replaced with one of your products?
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Emily from SWISCO responded:
September 1, 2023

Thank you for reaching out to us! I'm confident we can help with this but we'll need a bit more information. Can you show us a closer photo of the knife lock shoe? We will also need you to weigh each window sash and tell us the weight for each one. The stamps for your balances differ from our rating system so the weights will allow us to determine the proper strength options. 
A contractor from Chicago, IL says:
September 7, 2023
Hello, after some further measurement and photos...here is what i have:
Upper and lower sash balances, the 32HT is 32-15/16" long metal end to metal end, the 32HB (for the bottom sash) is 34-5/8" long. Both are 1/2" wide, and my sashes are 25 pounds each. here is some better pics of the tops and bottom...
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Paul from SWISCO responded:
September 11, 2023

Thank you kindly for waiting while we looked into this. The metal channel lengths for your balances are very odd and I'm afraid we can only supply balances that measure in full-inch increments. We recommend you contact Weathershield directly to see what they suggest in regard to replacements. I am very sorry for the inconvenience.
Short S-Clip
Short S-Clip
19-029
$0.65
Long S-Clip
Long S-Clip
19-030
$0.70
33" Series 751 Channel Balance
33" Series 751 Channel Balance
S751-33
$12.27
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