Anderson sash balance J3 5#23 784.

A handy person from New York says:
Hi - my anderson windows are at least 30 years. My guess would be early 1980's. The balance strings have snapped. I dismantled the header and sash balance is stamped with the Anderson name and logo. The model number stamped on the case is J3 5#23 784 (the space between the 3 and 7 is reduced). I was unable to find this model on your site. Can you offer any suggestions?
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Paul from SWISCO responded:
I sure can. I have one suggestion in particular, in fact. I recommend our 24-531, which is meant to replace Andersen sash balances stamped with "5#23."
A handy person from New York says:
Thank you Paul, I just ordered 2 of them.
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