Old Wooden Window Spiral Window Balance ~mid'50s

A handy person from Glenville, NY says:
1/2 diameter
Barrel length is 26 inches

User submitted photos of a window balance.
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Tom from SWISCO responded:
Thanks for posting, Duke. Can you confirm the diameter of the balance tube? It should be either 3/8" or 5/8" (it may also be 9/16", though it's considered 5/8" in the trade). Please double check and let me know!

Can you also tell me the weight of your window sash?
A quick learner says:
The diameter is very close to 1/2 inch, really 7/16th. So the closest option is 3/8.
The sash weight is 9.3 pounds
Thanks for your clarifying questions
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Paul from SWISCO responded:
Thanks, Duke! I think you might want to consider our S500-26 spiral balance with a 17-012 bracket. This kind of set up has been the standard for wood windows for 75 years. Check it out and let me know what you think.
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