Broken coil balance on both side of lower sash

A home owner from NY says:
June 30, 2021
I have a bath room vinyl window that has 2 snapped coil balances. There are no visible identifiers on the shoe, the coil, or the coil cap(?). The shoe is blue and looks just like your part 15-177. The coil is bronze or copper in color and has a triangular end with screw hole and the coil is 1/2" wide.

I need to replace the coil balances, but with no identifiers on my parts, I don't know which coil balance weight is the correct size.

Hopefully the pictures and post are enough for you to ID the right coil balance.

Thank you
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A home owner from NY says:
July 1, 2021
As a follow up I wanted to add that the sash is 13 pounds. I measured the weight unscientifically - I weighed myself on the bathroom scale, then weighed myself holding the sash. The difference between as 13 pounds.
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Bob from SWISCO responded:
July 6, 2021

Thanks for posting. I agree the pivot shoe resembles our 15-177, which uses the Series 152 Coil Balances. That was actually a great way to calculate the sash weight, so well done. If the sash weighs exactly 13 pounds, you can use two of the S152-6 6 pound springs, one for each side of the sash. This totals 12 pounds of overall support (being within 1 pound of the exact sash weight works fine). If your old coil housing is undamaged you can reuse it, but otherwise see the 15-143, 15-144 and 15-145. These components 'sandwich' around the coil spring.
Coil Balance Shoe, Slate Blue
Coil Balance Shoe, Slate Blue
15-177
$3.47
6 lb Series 152 Coil Balance
6 lb Series 152 Coil Balance
S152-6
$4.80
Coil Bushing
Coil Bushing
15-143
$0.97
Coil Bushing Cap
Coil Bushing Cap
15-144
$0.70
Coil Support Barrel
Coil Support Barrel
15-145
$0.49
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