Tom from SWISCO responded:
July 25, 2016
If your old coil spring is only 3/8" thick then I don't think the 1/2" Series 152 that usually goes with the 15-177 will work. Are you sure this is the hardware you need? Could you show us a couple pictures of your pivot shoe and coil spring removed from the window? Can you also triple check your measurements exactly? Thank you!
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Paul from SWISCO responded:
August 1, 2016
I'm not sure if a 1/2" coil will work, though it's possible your window has the room for it. The 15-177 is meant to work with 1/2" coils so I'm not sure why your original is 3/8". It's possible someone replaced the original coil with something smaller, but I can't be sure. Let me know how it goes.
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