Constant force coil does not keep window up.

Hi Vic,
See the following items; you only need to replace what is broken or missing and reuse the original screws:
15-180 Coil Balance Shoe
15-182 Balance Bushing
15-186 Coil Balance Clip
S190-840, Coil Balance Spring (this will replace coils with 8 stamp)

Now, if this coil was not holding the window it could be the sash weighs more than 16 lbs. A window with a #8 on each side of the sash will hold up to 16 pounds. Get the sash weight and we can work from there.

Thanks for getting back to us. Sorry to hear our springs didn't work. I wonder why they were stamped with the number 8. You mentioned that these springs worked with other windows, so it's possible the original installers assumed all windows were the same weight and just installed 8 pound springs in each one without checking.

Either way, I would recommend using an S190-540 and an S190-640 on each side. These springs should hold up your 22 pound sash. I would also recommend a 15-181 double support clip with two 15-182 bushings.

Yep, the 15-180 should work well for two springs. There is a screw hole on each side, one for each spring.