Paul from SWISCO responded:
February 16, 2017
Thanks for posting. Start by looking at our S385-30 channel balance. I think this could work for you. Your original is stamped 29 5, which matches our 2950 option. This is for sashes weighing 28 through 32 pounds. However, you say that your sash weighs 25 pounds. I would double check. If it is 25 pounds, go with the 2940 option instead.
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Casey from SWISCO responded:
February 17, 2017
In that case, because your original is stamped 29 5, which matches our 2950 option, and this will carry a window sash weight of 28 through 32 pounds, sounds right on!
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