Spiral balance rod

A quick learner from West palm beach says:
18 inch
3/8
spiral balance
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Paul from SWISCO responded:
You have an old Keller window. This exact balance is no longer made, but I think you may be able to substitute it with our Series 400 spiral balance and a bottom bracket like our 17-031. See what you think.
How to adjust a spiral balance on a non-tilt window
How to adjust a spiral balance on a non-tilt window
GUIDE
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