Paul from SWISCO responded:
June 20, 2017
I recommend our 15-191 pivot shoe, 15-206 coil spring support for four 3/8" coil springs, and our Series 165 coil spring. It's odd that you only have a balance on one side of the window, but with that in mind I would use four S165-5 springs. That should be enough for 20 pounds.
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