Acorn Window sprial balance replacement for tilt double hing windows

A home owner from Terra Alta, WV says:
What size do I require? and what type of balancing tensioning tool do I require? I believe that Acorn is a British company that for a short time sold windows in the USA? Is that correct?
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Tom from SWISCO responded:
I don't know what size you need, exactly. You will need to measure the diameter and length, then refer to this page. Follow the steps shown until you find the correct match. Tilt window spiral balances use our 75-006 charging tool.
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