Balancer. Have 2 older windows. Builder grade crap, about 20 yrs old. Couldn't find manufacturer marking

A home owner from Margate, NJ says:
October 22, 2017
Older spiral balancer. Measures 28.5 inch. Per posts, seems rounding up is advised.
S-600-29. 29" series 600 Spiral tilt window balance red tip. (#4)
Not sure of Pivot shoe. Any ideas. Seems 15-015 is close?
Will need Charging tool for tilt. 75-006

Thanks for your help.
User submitted photos of a window balance.
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Tom from SWISCO responded:
October 27, 2017
The 15-015 does look close, but that's just based on what I see here. You will need to remove it and compare your measurements to our listed dimensions to confirm if they're the same.

As for the balance, I think the S600-29 is the right way to go. As long as the outer tube is 5/8" in diameter, then you should be okay bumping up to 29" from your original 28.5".
Pivot Shoe, 17/32" Thick
Pivot Shoe, 17/32" Thick
15-015
$1.55
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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How to Remove a Pivot Shoe (Cutout Method)
How to Remove a Pivot Shoe (Cutout Method)
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How to remove window pivot shoes
How to remove window pivot shoes
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Anatomy of a tilt window
Anatomy of a tilt window
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