I'm wondering if anyone has had any success using the fiber sprockets from a bicycle chain derailer to make a chain tensioner for your MB drive chain. I made one this winter, and it seemed to work fine during a bench test. My first real test ride, unfortunately, will be months away up here in Wisc. My main concern would be that it has no real bearing, it's just a metal sleeve turning on a shouldered bolt so I wonder how long it would last at higher speed