Re: sprocket wobble
Brucemg51, find someplace to sit down holding your wheel with both hands between your knees. Somehow spin the wheel and look how bad the sprocket is wobbling. Take your thumb that is closest to the sprocket. Stick out that thumb until it barely touches the sprocket. Time the moment where the wobble makes the sprocket touch the thumb and stop it immediately. See which nut is closest to where your thumb touches the sprocket and tighten that nut by turning it slight to the right. Keep doing this until the wobble is gone.