Double coils and shoe

A quick learner from Winchester, VA says:
May 15, 2021
How do you tell how strong the spring(s) need to be?
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Thumbnail of the uploaded file named image.jpg
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A quick learner from Winchester, VA says:
May 15, 2021
The 24 lbs window has two springs one side where the inside spring is stamped "C" and the outside "CL". A different size 19lbs window has only one spring stamped "F".
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Emily from SWISCO responded:
May 17, 2021

Hi there!

It looks like you have our 15-175 pivot shoe which is compatible with the Series 152 coil springs. If your coils don't have any numbers included in the stamp, you'll need to weigh the sash and divide the weight by the number of coils on both sides of the window to choose the correct stamp option. 
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