Hey all. I just replaced the bearing on the left rear of my 81 Brat, and I'm having the same problem I had before it was replaced, that being a shimmy that feels like the rear wheel is loose. It doesn't do it if you coast, only if power is applied. I re-tightened the axel nut, and I got about five miles before the problem returned. Anybody have experience with this? The Brat has about 265 thousand miles on it. Thanks.