CertainTeed Window coil balance

A handy person from USA says:
Coils broken on both sides. Coils are stamped with SA 3610. What is your equivalent?
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Tom from SWISCO responded:
I'm afraid I don't recognize those stamps. I'll need more information. If you can, please remove all the balance hardware from the windows. Then, take a few pictures of everything for me to see. We will especially need pictures of the pivot shoe. Thanks!
A handy person from los angeles says:
window is double pane both springs broken

User submitted photos of a coil window balance.
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Tom from SWISCO responded:
Thank you! That shoe looks a lot like our 15-155. Do you agree? If so, then for the coil you should consider either our Series 170 or Series 171 and see if either of these are a match to your existing spring.
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