Tom from SWISCO responded:
September 8, 2016
Hmm... if your sash is exactly 17 pounds, I would stick with the 16 through 23 pound option. The lighter balance is likely to start droop eventually. Then again, having a balance that is too strong isn't any good, either, but with a sash of 17 pounds there really isn't any alternative. That is likely your best bet.
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