Replacement 23" Window Balance

A contractor from Cherry Hill, NJ says:
This is a 23" window balance with no names, numbers or markings. The top of the balance was secured by a single screw through the cylinder itself. Any help is appreciated
User submitted photos of a window balance.
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Paul from SWISCO responded:
Can you confirm the diameter of the balance's tube? If it's 5/8" or 9/16" then I recommend our Series 600 spiral balance. If you also need the shoe, you could consider our 15-015, but you will have to confirm that the dimensions match.
A contractor from Mantua says:
Hi, thanks for the reply, Paul. The balance diameter is 5/8 and I do need the shoe. So, you think I need the Series 600 with the 15-015 shoe?

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Paul from SWISCO responded:
Yep! Just make sure the dimensions match the shoe before you make your decision.
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