Spiral Balance ID

A quick learner from New York says:
Windows are over 20 years old. Trying to identify and replace the 23" balance, 3/8" diameter. No markings, names or numbers are available.
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Paul from SWISCO responded:

Thanks for writing in. For your 23" X 3/8" tube balance with nylon shoe, we believe you can use our S300-23 Spiral Balance as a replacement. Look it over and see if you concur. 

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