5/8 diameter and 27" long

A quick learner from Lee says:
5/8 diameter and 27" long I need 6 total
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Tom from SWISCO responded:

Your old balance hasn't been made in a long, long time. The good news is that I believe you can use our Series 500 as a substitute, along with a bottom bracket like our 17-012 (sold separately). Look these parts over and let me know if you agree.

How to adjust a spiral balance on a non-tilt window
How to adjust a spiral balance on a non-tilt window
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