Balance spring needed

A quick learner from New Jersey says:
April 13, 2024
Hello, I know I need a series 152 balance spring as it is a 1/2 inch wide. I'm not so sure on the weight size as the springs only have an E stamp on them both top and bottom window springs. I weighed the windows, and the bottom window is 16lbs and the top is 13lbs. I included a photo of the sticker that was on the window as I'm not sure of the manufacturer.
Any help you can give me in this matter would be greatly appreciated.
Thank You, Jerry
Thumbnail of the uploaded file named E Stamp
Thumbnail of the uploaded file named Coil Balance
Thumbnail of the uploaded file named Coil Spring
Thumbnail of the uploaded file named Pivot Shoe
Thumbnail of the uploaded file named Sticker
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Lauren from SWISCO responded:
April 16, 2024

Hi Jerry, thank you for posting,

Your pivot shoe resembles the 15-177 that is compatible with the Series 152 coil springs. Please review the dimensions below to confirm a good fit! 

For a 16 pound window, you can use (1) S152-8 coil spring on both sides of the window sash. For a 13 pound sash, you can use (1) S152-7 on both sides.

For a new cover if needed, see the 15-143 bushing, 15-144 bushing cap and 15-145 support barrel. Let us know what you think and if you have any additional questions! 
Coil Balance Shoe, Slate Blue
Coil Balance Shoe, Slate Blue
15-177
$3.47
7 lb Series 152 Coil Balance
7 lb Series 152 Coil Balance
S152-7
$4.80
8 lb Series 152 Coil Balance
8 lb Series 152 Coil Balance
S152-8
$4.90
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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