Double coil balance

A contractor from Shavertown pa says:
February 17, 2021
Help
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Bob from SWISCO responded:
February 18, 2021

Looks like you have a 15-180 Pivot Shoe. This shoe uses our Series 190 Coil Balances. Let me know if you have any further questions. 
A contractor from PA - PENNSYLVANIA says:
September 8, 2021
Is there another way besides the stamping to find what size balance I need?
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Bob from SWISCO responded:
September 14, 2021

Sure, you could weigh your sash on a scale and divide that by how many springs support it. Otherwise reading the old stamp is your only option.
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
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