Constant Force Tape Balance
Thank you very much for waiting while we looked into this! We don't have an exact match for this shoe but we suggest you consider the 15-192 and Series 170 coil springs. Can you tell us if there's a stamped code on the band of the coil spring? If not, we will need you to weigh the window sash on a scale and tell us the precise weight.
You will also need the 15-185 cover and 15-157 balance drum. You might also need to replace the pivot bar to fit in the 15-192 shoe. Can you remove an undamaged version from the sash and show us some photos?
Thanks for getting back to me! Please allow us a little more time to research this. I will reach back out to you the moment we have more information.