Today as I was going through the L I found that the outer edge of the splines are no longer square, but more triangular. Everything is worn the sprocket, shaft and the retainer plate. The bike only has 9,000 miles with the stock sprocket. What could cause this? Is it possible to shim the countersprocket back further onto the countershaft? When I pushed the sprocket in about the thickness of the retainer plate there was no more rotational play. I am just worried about the chain hitting the case. Has anyone done this? I did a search and it was mentioned, but I didn't find anything beyond that. I will get some pictures tomorrow.