I checked my sprocket and it seems to be drilled correctly, and it fits very tightly around the dustcap, so I believe it is centered, although the chain goes from very tight to very loose. I was thinking that possibly the chrome might have been applied too heavy on one edge. Beacause I have a 50t chromed sprocket I think just a minimal extra amount of chrome between the teeth would make a big difference. I have marked what I think is the "high" side, and was thinking about trying to grind in between the teeth. Any thoughts would be appreciated.