Milestone window balances

A home owner from UK says:
Hello- I need some channel balancers for a Milestone single hung series 1000. The metal channels are 29 inches long and are stamped UB28D.The sash weight is 27.2 lbs and I was wondering if i should go for the S380-29 option 2840 or 2850?
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Tom from SWISCO responded:
I would go with 2840. Two balances with this option can support 23 through 28 pounds. The 2850 option will likely be too strong.
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