Constant Force Balance System Replacement

Question

My constant force balance system recently broke for one of my windows.

I added pictures above. I believe the replacement for this is the Series 140 Quick Tilt, Dual Replacement; however, I wanted to make sure I select the appropriate replacement. I checked the coils for the stamps and noticed that the top coil is stamped as a 9 and the bottom coil is stamped as a 7. I included pictures, but they may be difficult to see. In this case, would I select stamp 16?

Also, can you confirm that I identified the appropriate part?

Thanks,

Charles

Casey · Accepted Answer

Hello,

The assembly shown in your photos resembles the 15-180 balance shoe, which uses the S190 coil springs. Your stamps indicate that you would need the S190-940 and S190-740. These coils use the 15-181 support and 15-182 bushings for installation. Take a look at these parts, as well as the related videos. Thank you!

Alternate image for 15-180