Constant force coils for tilt windows

Question

The one with the blue shoe is the old one I took out. The others with metal shoe is one I found and used but the blue one has a slot fits old pivot pin and new one does not . They are 40 lb windows and as can see stacked coils of 20 each side by a 6,6, 8 to equal 20 lbs for each side. I need new ones and I think the 161 is correct. My measurements are 9/16 by 1 1/4 by 2 1/4 tall for bottom one the others stack/ snap together.
So can I use it and get which pivot shoe pin goes with it? The old one used the metal clip and I like the new plastic one. Do they all work to hold the coils and can get the other?
So is 161 what I need? I saw a 210 . I think the coils themselves are 180? I have done one window but the new ones don't seem lock down so makes it difficult get window back in. So is the metal one different I got is why as opposed to the old plastic cam with slot or do windows with age just not hold it in place? Help?

Jasmine · Accepted Answer

Hey there,

Thanks for writing in! The balance with the blue cam, appears to be the 15-087 Coil Housing Pivot. The other balance pictured here looks like it could be the Series 161, which is not interchangeable with your existing assembly. Take a look at the dimensions below and compare them to the original housing to confirm that this is the right fit.

Detail of 15-087

You'll also need the 15-086 Tandem Coil Housing since your assembly will use more than one coil spring. Both the 15-087 and 15-086 are compatible with the Series 180 Coil Balance Spring. Since your sash weighs 40lbs, you can use the S180-10, two for both sides of the sash.

The compatible mounting bracket is part 16-024.