Window balance springs needed maker unknown

A home owner from Elkhorn,WI says:
November 22, 2023
Hi,

My window balance broke, I need a new one. Can you please help to identify this and quote a replacement if possible? I'd love to get one ordered immediately.
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Bob from SWISCO responded:
November 22, 2023

Hello there. This looks like either an S351-31 or S390-31. The only difference between these two channel balances is the depth of the bottom nylon shoe, or the measurement from 'heel' to 'toe'. See the illustration below for reference. Compare both with your old balance and see what matches best. In either case for a new stamp option, select 3040.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
31" Series 351 Channel Balance
31" Series 351 Channel Balance
S351-31
$11.52
31" Series 390 Channel Balance
31" Series 390 Channel Balance
S390-31
$11.30
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