dual spring balance

Quick Learner from Buffalo ny
My window is a mi window dual spring balance. I can't find a number on either the clip or the springs. The window is 30 by 30
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Paul
Paul from SWISCO
SWISCO
Expert

We estimate your sash weight to be 24 lbs., but you can veryify that by weighing it on a bathroom scale. 

If I'm right, you will need four S190-640 coil springs to go with the 15-180 pivot shoe, 15-181 double dent coil spring housing and 15-182 coil springs bushings.

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