Coil balance shoe?
Thank you
Thanks for reaching out to us. We don't sell this exact pivot shoe, but the 15-191 may be worth considering. This is 1/2" thick and 1-1/4" wide, so it couldn't hurt to double-check your dimensions to be safe.
The 1/2" Series 160 coil springs are sold separately. The video below will go over how to pick the correct spring weight.
Please let us know if you have any questions.
That's very strange. Coil springs must be used with the pivot shoe; otherwise, the window wouldn't be able to stay open.
Your window definitely uses some kind of coil spring. It's likely just too obscured by the window track, so you'll need to inspect it to confirm.