Paul from SWISCO responded:
June 23, 2016
Thanks for posting. Start by looking at our 15-087 shoe, 16-024 bracket, and Series 180 coil spring. Also be sure to see our 33-072 screw if you can't re-use yours. I believe this hardware should match what you have. As for what strength spring you need, it could be our S180-5. Each of these springs, individually, can carry 5 pounds. So two working together can carry 10 pounds. I believe your sash is around 9 pounds, so this should be perfect. Let me know what you think.
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Tom from SWISCO responded:
June 23, 2016
See our diagram below to get an idea of how the 16-024 is meant to be installed. As for the travel, the length of the Series 180 is actually around 35" so it should be more than enough.
Series 180 coil balance diagram
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