Balance replacements

A quick learner from USA says:
I have a 3/8" wide tube. The length of the tube is 28.5" I was going to order but not sure if I need a 28" or 29" , since there are only whole sizes.
Any assistance would greatly be appreciated
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Tom from SWISCO responded:
Hey, Roger. Hopefully I can help. There was a time when balance manufacturers designed their spiral balances to end on the 1/2", but over the years they phased those out. These days balances are only made on the inch. In this circumstance, I recommend going up to 29". This should still function well enough. If you go shorter, the window may not be able to close at all, so we definitely don't advise 28".
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