My chain parted and chewed a piece out of the inner primary case earlier this year. I had that repaired and now I'm putting it all back together again. Here's where I'm at ... And a close up of the sprocket / crankshaft ... The manual calls for the sprocket to be drifted onto the crankshaft to seat the sprocket onto the woodruf key, which I did. My question is, how do I know I've tapped that sucker in enough? Visibly it all looks good but is there a measurement that I can make to make sure it's seated correctly? Any help, advice, comments most gratefully received. Over to you Norton Guru's!