Sash Balance

A quick learner from Wellfleet, MA says:
Need to replace sash balance for window with markings saying "Anderson ?? Minn.". Then the letters B F ? 10# can't tell whether it's 31 or 34. 12-86. See attached photos.
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Bob from SWISCO responded:

See our 24-1033. This is meant to replace Andersen balances that include the stamp code 10#31, or 1031. 

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