Balance springs

A quick learner from Indianapolis says:
I removed the balance spring from a window and now that I am ready to put in a new one, there is no place for the screw to screw into. I think it's missing a balance screw plug. Any ideas?
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Tom from SWISCO responded:

Sure, as long as the hole is 1/4" x 1/4" square then you can use our 26-200 screw plug as a replacement.

How to install the 26-200 Screw Plug
How to install the 26-200 Screw Plug
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