Andersen Sash Balancer E3 9 27 3 71

A quick learner from Beaver, Pa says:
The sash balancers need replaced in several windows - home built in 1972 - Balancer has these numbers E3 9 27 3 71 stamped on it. My guess is a 939 based on the window size - Please advise. Bob
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Donna from SWISCO responded:
Hi Bob,
You are correct, choose product code 24-939, Andersen sash balance.
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