Tom from SWISCO responded:
June 13, 2017
Thanks for posting! Can you confirm the diameter of the outer metal tube? Based on the fact you have a blue tip, I think it might be more like 5/8" or 9/16". The outer tube is what you want to measure, not the inside spiral. Can you also tell me the exact weight of the sash? 40 pounds is extraordinarily heavy, and the spring strength indicated by a blue tip would have been insufficient from the start. If they ever held up the weight of your windows normally, then I would wager your sash is much lighter.
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Tom from SWISCO responded:
July 17, 2017
If the outer tube is 3/8" in diameter and 29" in length, and the sash is 20 pounds, then a red tip S900-29 should work, yes.
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