Window balance springs

A handy person from Manhattan says:
Hi! Spring broke. I'll have to wait ages for guys to come fix it and it's hot and humid ! I can't see any markings on the bar, which is 31 inches long, not counting the plastic bit. I'm fairly handy and expect to be able to install it myself. The bar is about 9/16, I guess 5/8. Thank you so much!
User submitted photos of window hardware.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting! If the balance is the only thing broken, see our Series 600 spiral balance. This has an outer tube diameter of 5/8", though it can work for 9/16" as well. Also see the video below for further information.
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