Coil balance

A quick learner from Georgia, 30096 says:
Sash weighs between 14-15 lbs. There is a patent number 5,353,548. One side is marked 3 or B with a marker.
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Casey from SWISCO responded:

Your pivot shoe resembles our 15-087 that is used with the Series 180 coil springs. Based on your sash weight, you would use one S180-7 coil spring on each side. Take a look and compare the specifications to your hardware and see what you think. Thank you. 

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