Anderson double hung windows

A quick learner from Bucksport Maine says:
We need to replace the sash balance in 4 windows. The balance box is marked Anderson 11600A-3 and 11600-17 and there are smaller numbers L91/1327 8P98 96
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Casey from SWISCO responded:

Hello,

Based on your stamp code, you would need our 24-L9-1327 Andersen sash balance. Also, see the opposite-handed version 24-R13-927 . Thanks for posting! 

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