window balances

A home owner from Newton, NJ says:
June 25, 2021
Only marking is a stamped 9 on coil.
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Paul from SWISCO responded:
June 25, 2021

Hello,

This looks like a 15-180 Pivot Shoe, which would use the S160 coil spring. The question is are you sure you need a 9 lbs. spring or could you need a 6 lbs. spring? Feel free to send a photo of the number stamped on the coil spring to confirm. Thanks for posting! 
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