C37 6#23 11-77 Andersen sash balance

A contractor from Alton NH says:
December 3, 2011
need a pair of sash balances for a 3032 Anderson window. C37 6#23 11-77 also for a Anderson window 3046. I don't know the numbers on this balance as I have not pulled it.
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Donna from SWISCO responded:
December 4, 2011
Hello,
Take a look at SWISCO product code 24-637, Andersen sash balancer, I believe this may be the needed replacement for the C37 6#23 11-77.
Let us know what the numbers are on the other window balances when you get a chance.
A contractor from Alton says:
December 5, 2011
I finally pulled the balance out of the 3046 and the numbers are E40 9#27 8-77. What do I need?
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Donna from SWISCO responded:
December 6, 2011
Please take a look at our 24-939 Anderson Sash Balance, which can be used to replace balance boxes with the stamped number 9#27.
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