Help in identifying proper sash balance

A quick learner from Cincinnati says:
I have a 3/8 diameter tube with a greenish blue tip, the problem I am having is that my tube is 28 1/2 inches long. What do you do in such a case?

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Paul from SWISCO responded:
Hello! Is this a tilt window? If so, and if your tube is 28-1/2" long, I would recommend moving up to 29". See our S900-29.
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