Paul from SWISCO responded:
February 21, 2017
I agree, the S180-5 looks to be the best match based on your old stamp. A good way to confirm this is to get the weight of your sash and divide it among the number of springs used to support it. For example, if your sash weighs 20 pounds, and you use four springs altogether, you would want springs that can carry 5 pounds each.
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