Coil Cover

A handy person from Michigan, USA says:
August 22, 2022
Hi- I purchased some 15-150Ds to replace a handful of coil covers that are breaking down but as you can see from the picture they're not quite the same. I installed one, and it works, but the sash doesn't slide past the cover without pulling in the retaining clips. It also seems a tad loose in the frame since only one replacement screw could be used. Do you have the proper cover?
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Tom from SWISCO responded:
August 23, 2022

It sounds like the 15-150D is too big for your track. Note that this is only designed to work with 1/2" thick springs. You may want the 15-204 instead, which is meant for 3/8" thick springs.

You should measure your old spring before you buy anything else. That way you can be 100% sure.
A handy person from Michigan, USA says:
August 23, 2022
The existing springs look to be just over 3/8 at 25/64, would this be considered a 3/8 spring?
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Tom from SWISCO responded:
August 23, 2022

Yes, I think it's safe to say that what you have classifies as the 3/8" spring. That's only 1/64" off, which is a negligible difference for what you're doing here.
1/2" Coil Double Support
1/2" Coil Double Support
15-150D
$1.57
3/8" Coil Dual Support
3/8" Coil Dual Support
15-204
$1.88
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