Channel balance for 41 lb window

A handy person from Pinellas Count, Florida says:
I'm looking for channel balance for our windows. The balance is the 385 but our windows are just a hair under 41 lbs. I put them on a scale to weigh them. Do you make a balance that works for this weight or can I but the parts and reuse the channels and springs. I would need the tops, bottoms and the block and tackles?

I would need to replace 12 of these to replace them on all the windows

Thank you,

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Paul from SWISCO responded:
We could custom make an S385-34 balance with a 3370 option. Two balances with this option can carry a sash weight of 39 through 42 pounds. If that can work for you, just let me know how many balances you need and I can send you a custom order form and price quote.
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