Window balance?

A home owner from Springfield MO says:
Only info we can find on Window is PAT# 5737877. We just bought a house and almost all of these are broken in one way or another. Windows themselves are in good shape, just won't stay open. Please help, we can not afford to replace all the windows! Thanks
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
See our Series 860 balance to start out. I think this could be a good match for you, but look it over and tell me if you agree.
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