Tube cover for balance coil

A quick learner from Groveland , FL says:
4 failed cover tube for balance springs. 40 inches long due to sun rot.
A quick learner from Groveland , FL says:
Trying to attach picture
window balance
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Paul from SWISCO responded:
Thanks for posting. I'm afraid these plastic tubes are not available alone. If yours is broken, you will need an all new balance. Ours are made with metal tubes, so they shouldn't break similarly in the future.

Can you confirm the diameter of the outer tube? If it's 5/8" or 9/16", I would recommend our S600-40.
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