Paul from SWISCO responded:
December 1, 2015
Thanks for posting, Dennis. I recognize this balance. It's a very old type not used anymore. I believe that our Series 500 spiral balance can be used as a replacement, in addition to our 17-012 bracket. This setup has been used in wood windows since the 40's. Check out these suggestions and let me know what you think.
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Paul from SWISCO responded:
December 1, 2015
It's hard to say for sure. The Red Tip is usually a safe bet for these old windows, but there's no saying if yours is heavier than normal. You may want to put a scale on the sill and gently lower the sash on it to get a ballpark. It's not ideal, of course, but it'll at least give you a better idea.
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