Windows counterbalance part that moves

Question

This is the part that moves up and down in the track for the double hung vinyl windows. The window 'slides' 14.5 inches and weighs 15 pounds.

I'm also looking for the part that stays 'fixed' in one place which the spring attach onto.

Tom · Accepted Answer

Hello! Looks like you need a new coil balance system. Thanks to your helpful pictures, I have a pretty good idea of what you need. See our 15-175 shoe and Series 152 spring to start out.

We don't have that exact cover in your last two photos, but the parts I mentioned are compatible with our 15-143 and 15-144 bushings and 15-145 drum. These sandwich over the spring to keep it stable in the track.

You also mention that your sash is 15 pounds. That's a bit awkward for this kind of spring. They usually support sashes with an even number weight, since you distribute the load evenly between each side of the window. You could use the S152-7, two of which can support 14 pounds, or you can use our S152-8, two of which can support 16 pounds. The first option will be a little weaker while the second option might be a little too strong.