Paul from SWISCO responded:
June 9, 2017
You have an old bracket that is riveted on the spiral balance. So you would need to replace both the balance and bracket to get modern hardware to work. We suggest our 17-012 bracket with a 5/8" diameter Series 500 siral balance. This balance system has been used for wood windows since the 1940's and I think it will work well for you.
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