Spiral Balance for Double Hung tilting window

A handy person from Columbus, Oh says:
May 13, 2017
I have a red tipped, 3/8" diameter, spiral balancer (x2 for one window). When measuring the length of of the both metal tubes, I am exactly in between your available selections of 28" and 29", I measured the metal only portion and get exactly 28 1/2". My question is, which size do I pick for a replacement, 28" or 29" ? Or do you have another custom selection capability or suggestions?

Thanks for your support and nice web site for you products!!
Matt
A handy person from Columbus, Oh says:
May 13, 2017
In addition, the windows that I have failed balancers are all of the smaller 3/8" diameter, red tip, style, and all are the same measured length of 28.5". Do you suggest going to the higher weight capacity green tip or above?

Thanks again. Matt.
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Tom from SWISCO responded:
May 16, 2017
Hey, Matt. Older balances were once made on the 1/2", but modern manufacturers only make them on the full inch. We find that bumping up to the next highest inch works fine; in your case, I'd go with 29".

I would weigh your sash on a scale and refer to the chart on the S900-29 store page to confirm the best color tip option.
28" Series 900 Spiral Balance
28" Series 900 Spiral Balance
S900-28
$9.10
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How to replace a tilt window spiral balance.
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