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Coil balances for 15 lbs. sash

A contractor from Mass says:
Would like to retrofit 200 year old sash with coil spring balances. Sash is 37"w x33" h weighting 15 lbs what do you recommend? Sash have no balances at all now
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Paul from SWISCO responded:
Thanks for posting! I, personally, would take a look at our Series 500 spiral balances, with 17-007 brackets, and see if anything there would fit this application. These have been used by wood window manufactures for close to 100 years. That said, it's hard to determine what balances would work when retrofitting a window, and I can't say for certain what you need. If I were you, I would contact a local millworks and see if they have any advice for you, as well.
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