Tom from SWISCO responded:
July 6, 2017
Great question! If your window was hard to open, and the stamp on the balance does not match the weight of the sash, you may have had a less-than-ideal stamp option on your previous balances. The weight of the sash is a far more accurate predictor of the stamp option; go with 2530 for a 17-18 lb door, even if it doesn't match what is stamped on the old balance. Need any more info?
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