SWISCO - The Replacement Hardware Authority

Anderson Narroline Sash Counterbalance

A handy person from Alameda, CA says:
Number(s) on counterbalance (11600 17) and (D75 7127 833). For a 28-7/16W X 23-15/16 (glass measurement) window. I cannot find numbers that match what I have. Are these numbers obsolete?... and if so, what is the correct replacement number?
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Tom from SWISCO responded:
Thanks for posting. I think the key number here is that "7127." Can you tell me if the "1" is printed a little differently from the other three numbers? If so, I think you need our 24-737. This can replace Andersen sash balances with a stamp of "7 27."
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