Coil #s

A quick learner from Tazewell va. says:
One coil #3 and one coil #5
coils are 1/2"
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Bob from SWISCO responded:

It looks like you have a 15-111 Pivot Shoe, which uses Series 160 Coil Balances. Those stamp codes might indicate you need the S160-3 3.5 lb spring and the S160-5 5.5 lb spring, but you may want to double-check the weight of your window sash to confirm.

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