Sash Tensioner for double hung window

A quick learner from Asheville says:
Can you identify this part? I think there is a cover that goes with it.
User submitted photos of window hardware.
A quick learner from Asheville says:
Can you identify this part? It goes to a vinyl double hung from the year 2000.
User submitted photos of window hardware.
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Paul from SWISCO responded:
Thank you for posting with images. I believe you may have a coil balance spring system and what you are showing us is a broken piece of a spring cover that looks like our 15-150S. Can you confirm that? Send us some additional photos of your window balance system. Please make sure the hardware is as undamaged as possible. If you have an identical part in your window that isn't damaged, that'd be ideal.
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