very well put, mountainman. i'm making this my priority because my new build is fast enough to scare most people riding it. the tensioner pulley is the weak link on multi-speed bikes with an offset rear wheel. if either the tensioner pulley , smaller teeth sprocket, or rear wheel moves slightly out of alignment to the engine sprocket, the rider is going to get seriously hurt when you're gunning down the road at 30+ mph. i spent over 3 hours reading every post about tensioner pulleys and have collected pictures and such on various home made ones. if anyone needs them i can email them to you. sorry but i neglected to document the names of the posters but i will try and go back and add them to my compilation because they really deserve proper credit.