Paul from SWISCO responded:
November 21, 2016
It sounds like the springs aren't strong enough. Take a look at our 1/2" thick S160-6, this may fix your issue. Each of these springs can carry 6 pounds each, as opposed to the 5 pounds your current spring can carry.
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Tom from SWISCO responded:
November 30, 2016
Do you know the exact weight of your sash? That's probably the issue. Once you know how heavy your sash is you can be 100% sure what strength spring will work.
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