SWISCO - The Replacement Hardware Authority

Anderson Sash Balance K10 9#31 5-77

A home owner from Dublin, Ohio says:
The only number I can find on the existing units is:
K10 9#31 5-77
Do you have a replacement for these?
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Donna from SWISCO responded:
Hi, Take a look at 24-939, this is suggested by Andersen to replace balance boxes with the stamp 9#31.
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