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Where to buy round rubber belting online? So far, I have one or
two possibilities, McMaster-Carr and Cadence Supply Company.

Also. How can you tell the minimum pulley outer diameter of a
rubber belt? McMaster-Carr says that their 3/16 inch rubber belts
have a minimum pulley diameter of 1 1/2 inches. Is there some
rule, like a belt that is twice as thick requires a pulley that is
twice as wide?

Any other information about rubber belting is appreciated. Like
resources for gluing the ends together. I will check YouTube.

Thanks.