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Author Message   Clay Tinkerer Username: Clay Post Number: 46 Registered: 12-2006 Rating: N/A Votes: 0 Posted on Friday, January 13, 2012 - 10:59 am:    I think the inner tube just has a narrow strip of a felt-like material glued around it to provide friction for the outer tube. It wears down and gets slick. Not sure how one would rejuvenate it though. Best regards, /clay