Paul from SWISCO responded:
October 13, 2016
Thanks for posting. I recommend looking at our S900-28 spiral balance, this appears to match your specifications.
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Tom from SWISCO responded:
October 14, 2016
Thanks for clarifying! In that case, I think you'll be okay bumping it up to S900-29. Some older window manufacturers used to design their spiral balances on the 1/2", but that style has been phased out. Modern balances are all made on the inch. When encountering the old 1/2" balances, we find that rounding up to the next inch is the best way to go.
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