Spiral window balancer

A home owner from Houston Tx says:
There is no marking on metal tube. No tilt window. The spiral tube is 9/16 diameter and 26 7/8 long. The leg is 3 inches long and 3/8 wide. The window weighs around 8 lbs. Reply ASAP
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Tom from SWISCO responded:

Your balance isn't made anymore, but I believe you can use our Series 500 as a substitute, along with a new bracket like our 17-007 (sold separately). Look these two parts over and let me know what you think.

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