Broken coil balance

A quick learner from Rochester hills, Mi says:
Window would not stay open. Found the coil on the balance had snapped. Window is approximately 31x26.5.
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Emily from SWISCO responded:

Hey there!

Thank you so much for your patience during our busy season! Take a look at our 15-180 coil balance shoe, which uses the Series 190 coil spring. Look over our dimensions and compare them to yours to see if this matches what you need. 

A quick learner from Rochester hills, Mi says:
Which size spring would I need?
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Emily from SWISCO responded:

If your dimensions match ours, you would need the Series 190 coil balance. To determine the coil weight you need, you would weigh the sash on a scale and then divide that weight by how many springs you have in the window. For example, if you had four springs total (two on each side) and a 12 pound sash, you would want four 3 pound springs. Let me know if this makes sense. If you're still unsure, let me know the exact sash weight and we can work it out from there. 

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