Spiral balance from 1940s

A quick learner from Wickliffe, Ohio says:
October 27, 2020
This is the internal spring from a 5/8 tube. Bottom tab wraps around the bottom of the sash held in place by one screw. Tab is broken where screw hole was.
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Bob from SWISCO responded:
October 30, 2020

Thanks for writing in. For these old wood window spiral balances, we recommend our Series 500 along with a bracket like our 17-007 or 17-012. We have used this combination to repair wood windows like yours for decades. See what you think.
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