spiral spring selection

A handy person from florida says:
Old spiral is blue tipped, 29" long and is 5/8" in diameter. The window weighs 40 lbs. and is non tilt. What replacement spiral rod do I need? I want to replace both of them.

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Donna from SWISCO responded:
Hey, Ron! Our Black tip option can carry 31 through 40 pounds. I believe this will work for you.
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