Window hardware

A handy person from Butler PA 16002 says:
I sent over pictures with all the numbers I find on the window. The window has no tension so the window will not stay up. I need to be able to replace the spring but cannot find it on your website. Please let me know if you can help me out.
Thanks
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Tom from SWISCO responded:

Sure, we can definitely help. So, your pivot shoe looks like our 15-199, which tells me that you probably use our Series 160 coil spring. You should look it over just to be sure. Note that our Series 160 spring is 1/2" thick. If yours is any other size, please let me know and we can recommend something else.

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