Paul from SWISCO responded:
February 28, 2017
I'm afraid your balance system is no longer available. That said I believe you can use our Series 500 spiral balance with a 5/8" outer tube. I'd also recommend a 17-012 bottom bracket, which attaches to the bottom of the sash. For a 10 pound sash you should be able to use a red tip color option. I would just confirm the length of the old outer tube.
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Paul from SWISCO responded:
March 1, 2017
Hmm... if the length of the old tube is 30-3/4", then I think you could get away with using our S500-31, yes.
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