Update, but without pictures. After some carefull work with the file and 320 grit on both the axle and the sprocket, it slid on easily. Same for the new, outer bearing. I managed to locate the spring clip for the master link which had launched itself into the hull somewhere, and proceeded to put it all back together. First time, I forgot about the mastic on the outer bearing housing. Second time, I forgot to put the spacer washers between the axle splines and the inner bearing.Third time, I put the outer sprocket on the wrong way aroundSo, 4th time, it's all good, everything in its place and teh axle turns freely, so not bent. The new chain adjusters keep the chain a little tighter than I'd like, even backed all teh way off. If I put the roller on the other way around, it's too loose, so there's no good compromise. I'll go for too tight, as too loose lets the chain drag on the bottom of the hull. One more new chain adjuster to do, and it's going back together. Not a terribly hard job, but then it's the easy rear axle, so...