Tom from SWISCO responded:
April 14, 2017
Thanks for posting. It's possible the springs you purchased were not the correct strength fo your sash. Can you tell me how heavy your sash is?
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Paul from SWISCO responded:
April 20, 2017
I think you had too much spring tension for your sash weight. The difference between 22 pounds and 26 pounds isn't an awful lot, but it may have been too much in this case. Plus you combined a 9.5 pound spring and a 3.5 pound spring, which may be a little too unbalanced. You may want to consider a combination of the S160-6 and S160-5 instead. This will support 24 pounds, which is a little less, and the two springs are closer in strength.
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