Identity of coil balance/pivot shoe replacements

A handy person from Lancaster, KY says:
April 27, 2020
Good morning!

Only the bottom half of the window raises/lowers and tilts (single-hung?). The bottom half is 30 inches in length, and weighs 18 lbs. It looks like it uses a double coil balance on both sides, but the coil is narrower than a half inch, but the shoe is wider than the coil. There is a notch at the top of the window channel to slip the mechanism in and out of the channel. I could find no marks on the coil or the coil holder. Also no markings to determine the window brand.

Thank you! Winston
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Bob from SWISCO responded:
April 30, 2020

Hi Winston. This Pivot Shoe resembles our 15-177, which uses our Series 152 Coil Springs. If your old springs are undamaged you don't need to replace them, but if you do, and if the window sash weighs exactly 18 lbs, then you can just use (2) of the S152-9 9 lb Coil Springs, one for each side of the window sash. Note this will be one less spring on each side of the sash than you currently have, which is totally fine--with coil balance systems, you just need to match the weight that has to be supported. It will also be a lot easier to reinstall. Let me know if you have any other questions.
Coil Balance Shoe, Slate Blue
Coil Balance Shoe, Slate Blue
15-177
$3.47
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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