Paul from SWISCO responded:
November 21, 2016
I agree, our S385-35 looks like a good match. Regarding the spring strength, a stamp of 34 5 usually corresponds to our 3450. This is for sashes weighing 30 through 34 pounds. If the windows are hard to open, it may mean that the 3450 rating that you have now is too strong. I'm afraid the only way to confirm is to weigh your sash on a scale.
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