rimotorbiker, The spring tensioner from TSC is good, but you might find that you have to obtain a stronger spring. I had to modifiy my quite a bit to fit my bike, and just added a regular spring to pull from the back side. It worked well, and I eventually removed the roller and went to a sprocket which has been great. A lot of guys seem to be going to the t-shirt shims which make a lot of sense. I might try them on a second build. Good Luck