Replacement Sash balance

A home owner from St. Louis, MO says:
I need to replace a sash balance left side called BF 10#31 5-86. Do you have the replacement part for this item?
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Tom from SWISCO responded:
Thanks for posting, Suzanne. Do you have an Andersen window? If so, I recommend our 24-1033 Andersen Sash Balance, which can replace all balance boxes with the stamp 10#31.
A home owner from St. Louis, MO says:
Yes, Andersen window. Thanks for your help locating the correct part.
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