On every MB I've seen or pictured here, a wheel or roller is used for the tensioner. Has anyone ever tried a sproket instead. Where I work there are lots of high speed conveyors, filling and capping machines and many are chain drive. All of the tensioners I see on these machines use sprokets as opposed to rollers. I can see where the alignment with a sproket would be more critical than would be required with a nylon roller but there are some very nice bearing style sprokets available, (one or two might be scroungable). Is it a no-no or has anyone tried it?