Paul from SWISCO responded:
July 26, 2016
We should be able to help, but I would like you to confirm a couple details. First, what is the length and diameter of the white outer tube? Also, what is the weight of the sash?
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Paul from SWISCO responded:
July 27, 2016
You will need to place the sash on a scale to determine the weight. Also, just to confirm, is 3/8" the diameter of the tube or the inside coil? The most important diameter measurement is for the tube, not the coil.
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Paul from SWISCO responded:
August 4, 2016
Thanks. I would wager the outer cover is actually more like 5/8" or 9/16". I do not believe they make a 7/8" balance but 5/8" and 9/16" are common. I would recommend our S600-27 spiral balance with a red tip option.
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