ANDERSON SASH COUNTERBALANCE E50 9#27 10 77

A contractor from SAINT LOUIS, MO says:
July 15, 2011
I HAVE A SASH COUNTERBALANCE WITH A NUMBER ON IT AS FOLLOWS.
E50 9#27 10 77.

WHAT WOULD THE REPLACEMENT PART NUMBER BE?
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Donna from SWISCO responded:
July 15, 2011
Thank you for posting.

Please take a look at the Swisco 24-939 Andersen Sash Balance.
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