Constant force spring

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This is from a bathroom window. 23"x20". The lower sash weighs 10 lbs. 
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Casey
Casey from SWISCO
SWISCO
Expert

Hello,

Your pivot shoe resembles the 15-180 below. You'd need two S190-540 coils on each side. We also offer the 15-181 support and 15-181 bushings. Thanks for posting! 

Alternate image for 15-180
Alternate image for 15-180

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