Andersen sash balance

A handy person from Woodbridge NJ says:
April 13, 2022
Andersen Corp. Bayport Minn. 11600-17.
Other numbers are : 11600A-3
U.S.PAT.No'S 3.335.455 PAT 1967CAN
on the mounting boss: 927 8R38 /orBR38/ 2 91

From your posts it follows that it will be Andersen sash balance 24-531, - but I want to be sure before I place an order

Joe
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Paul from SWISCO responded:
April 14, 2022

Hello,

The 927 stamp on your assembly leads us to believe that you will need the 24-939 Andersen balance box for your repair. Take a look and thanks for posting! 
Andersen Sash Balance, 927, 931, 937, 939
Andersen Sash Balance, 927, 931, 937, 939
24-939
$54.20
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