Coil balance. With no markings

A quick learner from Oscoda mi says:
January 27, 2021
The balance measures 9/16×1-1/4 and looks like a single coil. It's for a single hung window. The bottom sash measures 28w x 23t. I took it apart and put it back together so they could continue to use it. I didn't think to weigh the window . Thank Tony
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A quick learner from Oscoda mi says:
January 27, 2021
Went back and I got the weight of the window being apx. 13 lbs.
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Paul from SWISCO responded:
January 28, 2021

We believe we have a similar balance system. Look and compare the 15-228 pivot shoe with S160-6 coil spring. Using S160-6 coil springs on both sides of the sash will hold a 13 pound sash. The nylon coil spring cover, the 15-150S is simple to use. You place the coil spring inside above the bottom bumper in the cover.
6.5 lbs Series 160 Coil Balance
6.5 lbs Series 160 Coil Balance
S160-06
$4.85
Pivot Shoe, 17/32" Thick
Pivot Shoe, 17/32" Thick
15-228
$2.57
1/2" Coil Single Support
1/2" Coil Single Support
15-150S
$1.10
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