Spiral Sash Balance

A home owner from USA says:

I need 2 replacement spiral sash balance(s) for an old (1950's?) non-tilt double hung single pane window.

The original balance(s) are 3/8" diameter & 19" long made by Unique Balance Co.

I would like to hopefully match the old style if possible.

Recommendations?

Pictures attached.

Ken

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Tom from SWISCO responded:

Hey, Ken. I don't think you're going to find the old style anywhere, unfortunately. When it comes to these old balances, we usually opt for our Series 500 spiral balance, along with a bottom supporting bracket like our 17-007 or 17-012. We find this setup works just as well. 

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