Spiral Balance 1/2 wide, 15 metal long.

A quick learner from North Brunswick NJ says:
September 29, 2020
Need to identify right part replacement set
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Bob from SWISCO responded:
October 2, 2020

Double-check the diameter. If it's 9/16" or 5/8", then you have an S600-15. Now, it looks like you need a White Tip option, which would support a window sash in the weight range of 4 through 11 lbs. Let me know if that sounds correct, or if you have further questions. 
15" Series 600 Spiral Tilt Window Balance
15" Series 600 Spiral Tilt Window Balance
S600-15
$8.07
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How to replace a tilt window spiral balance.
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