This surprised me since I had lapped, and retorqued the hub nut, but that was more like 5,000 miles before this happened. Fortunately it started showing problems at an autocross so I just put it on the trailer and went home. Then it was months before I could get to it (I've got kids now and was working on a MBA at the time). When I got to it I thought it was the clutch so I pulled the engine multiple times before realizing the problems was farther back. All that time I did not notice the wobbly wheel partly due to the Wide tires.
Anyone have suggestion for the best source of parts? RD Enterprises lists $500/hub and $500/shaft, but they are new higher strength parts.