Joined: Nov 2006
Posts: 3,391
Likes: 1
From: duluth
Bikes: '07 Pista, '09 Fantom Cross Uno, '8? Miyata, '67 Stingray, '0? Zoo mod trials, Tallbike, Chopper, '73 Schwinn Collegiate, '67 Triumph Chopper, '69 CB350, '58 BSA Spitfire, '73 CB450
Probably time for a new crank arm. Guessing that the inside surface is all marred from "wobbling". It just takes a couple "wobbles" for the surface to get messed up, no matter how hard you tighten it, it will move a little when you pedal, slowly unscrewing the crank bolt.