Coil balance replacement

A contractor from Louisville, KY says:
Hello, the sash weighed 18.6 ibs. Im needing the coil balance and accessories for one sash.
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Casey from SWISCO responded:

Hello,

I can't be positive with your hardware still installed but I would recommend removing your balance assembly to compare to the 15-177 pivot shoe, which uses the S152 coil springs. I would recommend using one S152-9 coil on each side to support an 18.6-pound sash. Thank you!

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