double hung window won't stay up

A quick learner from Des Moines says:
April 13, 2017
my spiral balances are 19.5 inches, 5/8 diameter and red color tip. can't find name or number of manufacturer, but the windows are vinyl and over 20 years old.
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Tom from SWISCO responded:
April 17, 2017
Thanks for posting. Are these tilt windows? If so, I'd recommend our S600-20 spiral balance. I believe this should work. Many manufacturers used to develop spiral balances that measured on the 1/2", but this hasn't been the case in a long time. We find rounding up in such instances to be a safe bet.
20" Series 600 Spiral Tilt Window Balance
20" Series 600 Spiral Tilt Window Balance
S600-20
$8.44
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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How to Identify a Replacement Spiral Balance
How to Identify a Replacement Spiral Balance
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How to choose the proper spiral balance tip color
How to choose the proper spiral balance tip color
GUIDE
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How to adjust a spiral balance on a tilt window
How to adjust a spiral balance on a tilt window
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