30" spiral balance for tilt sash

A home owner from Florida says:

I need a part number for a 30" white balance for a sash weighing 36 LBS.

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Tom from SWISCO responded:

Thanks for contacting us. I see you were looking at our S900-30. Is this the size of your balance? If so, can you confirm the exact weight of the sash? There is no 3/8" balance we can find that can carry that kind of weight. The absolute strongest option ever made for the S900-30 can only carry 34 pounds at maximum. I'm not sure if that'll be enough.

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