Anderson window balance

A handy person from Danvers, MA says:
BF3 9#31 6 83
11600-2
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Emily from SWISCO responded:

Hello!

Based on your 9#31 stamp, I recommend the 24-939. Look this part over and let us know if you have any questions.

How to replace an Andersen Window Balance
How to replace an Andersen Window Balance
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