S152 Coil Balance Spring Replacement

A home owner from NY State says:
March 18, 2021
My bathroom window weighs 10 lbs. I noticed the Balance Spring was broken on both sides of the window. My Balance Spring matches the S152 model on your website. I need to replace the Balance Springs on both the left and right side. Which pound series do I need?
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Tom from SWISCO responded:
March 18, 2021

That would depend on how many springs you have on each side. Assuming you only have one spring per side, then you want the S152-5, which carries 5 pounds per spring. Since you have two of them on the window, that adds up to 10 pounds.
5 lb Series 152 Coil Balance
5 lb Series 152 Coil Balance
S152-5
$4.80
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