Broken window balance system

Question

I have a broken balance system in a couple of the windows in our home. Windows are older, but I am trying to fix over replace. The PAT. #5.737.877 is found on the old broken balance system. Is there a part available to fix these windows. I believe this balance system is no longer around. Thank you.

Casey · Accepted Answer

Hello,

The old-style block and tackle balance shown in your photos is no longer available but we do carry modern replacements. Your pivot shoe resembles the 15-152 depending on how the width and thickness compare to yours. If it's a match, you would use the S770 channel balance with a terminal clip that attaches to the pivot shoe.

This is a direct replacement for your balance system but you will need to confirm the length of an undamaged balance, as well as the exact sash weight to follow the chart shown under the balance product description that indicates the strength option you'll need to support the window. Thank you!