SWISCO - The Replacement Hardware Authority

11600-17 Andersen Sash Balance

A quick learner from Massachusetts says:
I have Anderson Windows that are about 25 years old also and need to replace the sash balancers. The only part number that I see stamped on the originals is 11600-17. There is also a number on the staple flange, 623 and BH36 4 91, Should I be replacing with 24-637 or another?
Thanks for your help.
Bob
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Paul from SWISCO responded:
Yes! The key stamp here is "623," which corresponds to our 24-637.
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