Paul from SWISCO responded:
February 24, 2016
The manufacturer of your balance has gone out of business, but we can still help. I would look at our S770-28 channel balance to start out with, along with our 28F option. You may want to weigh your sash just to confirm that this can substitute your old 27F. Two balances with a 28F option can carry a sash weight of 32 through 36 pounds. If your sash falls in that range, you should be good to go.
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