sash balance

A handy person from northport ny says:
This is what is stamp on balance w10 827 2-88 21-0091 it is a anderson narrowline built in 1988 is ypur product # 24-837 the correct part for this window before I order it
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Tom from SWISCO responded:
Yes, the 24-837 can replace Andersen balance boxes with the stamp 827.
How to replace an Andersen Window Balance
How to replace an Andersen Window Balance
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