Single Hung Window Balance Springs

A home owner from San Diego, CA says:
January 7, 2024
I need to know which replacement balance springs to order. The balance springs are 26" long with the writing numbers/letters of 25 3 JW CMC 11. Four pictures are attached for your information.

Thanks,
Bud
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Bob from SWISCO responded:
January 7, 2024

Hey Bud. This looks like either an S380-26 or S385-26. The only difference between these two balances is the depth of the bottom nylon shoe, or the measurement from heel to toe. See the diagram below for reference. Compare both balances with your old one to see what matches best. In either case, for a new stamp option choose 2530.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
A home owner from San Diego, CA says:
January 7, 2024
Thanks Bob. Your information was very helpful and I just made the purchase. The correct model was the S380.

Bud
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Bob from SWISCO responded:
January 7, 2024

Excellent, glad I could help Bud. Let us know if you have any other questions, and thanks for reaching out. 
26" Series 380 Channel Balance
26" Series 380 Channel Balance
S380-26
$10.55
26" Series 385 Channel Balance
26" Series 385 Channel Balance
S385-26
$10.55
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