Paul from SWISCO responded:
July 14, 2017
This old General Aluminum window uses a 3/8" diameter Series 400 spiral balance. See what you think. The clip that is screwed on the side of the sash is most likely the 17-052, but it's hard to tell. These windows are not made to come out, so replacing them can be a bit of a hassle. You will need someone to hold the window up for you while you try your best to get in there and swap the bracket out.
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