Paul from SWISCO responded:
November 24, 2014
Your method of converting coil springs for wood windows is great. Unfortunately, that is the maximum length you can have with coil springs. Now, if you could mount the coil springs in the middle of the window jamb and attach it to the bottom of the sash, that you give you a little more. Another way is to use our Series 500 balances with the 17-012 bracket. These were used in the 40's on wood windows. The only caveat is that you would have to rout out a channel in the sash for the balance tube.
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