double hung window-spring is broken that keeps window open

A home owner from new prague, minnesota says:
The spring which is about 12 inches long broke, it slides into a channel and holds the window open. The window won't stay open now that the spring is broken. Any ideas on how to get a replacement spring. These are old wood windows, no manufacturer name. I can submit pictures if that would be helpful.
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Paul from SWISCO responded:
Could you show us a picture of the hardware in question? I would like to see both the spring and the channel in which it installs. That will get us started.
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