which part should I choose?

A quick learner from Levittown, PA says:
September 26, 2022

My window sash weight is 17.8 lbs. One side spring is broken. The shoe looks like your S140-10. I am not sure if I need to buy S140-10. The spring is single, its width is 11.8mm (0.464").

The shoe width is 1.25", 0.5" thick. Please help.

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Tom from SWISCO responded:
September 29, 2022

Hello! I agree, our Series 140 looks like a great match. Since the stamp on your old cover is 10 then the S140-10 would be my pick, as well. You can always weigh your sash on a scale to confirm.
10 lb Series 140 Quick-Tilt, Single
10 lb Series 140 Quick-Tilt, Single
S140-10
$9.85
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