He first said he didn't have it apart... So I'm going to assume, and we know what we do when we assume, That he first had the problem before he unassembled it. ... With the spacer, thrust washer, prop hub, prop, washerand prop nut installed and tight, There should oly be 0.1-0.3mm of end play in the crank. that small amount of travel would be bearly noticable if u pushed and pulled on the shaft. the other thing he said that it was rough when he pushed and turned the shaft. that would indicate to me only one problem, Since the parts are all there now.. when he put the prop on the first time (although he didn't remove any of the parts that go on before the prop) they moved off location and the spacer washer got lodged on the land of the flat that is ground into the crankshaft for the prop hub so he had more play in the crank than he should have had. ... good thing he didn't use a electric starter or real damage would have been done... u may have put some scrapes into the backplate but other than that you should be fine. just make sure that the spacer and thrust washer are seated on the bearing before u tighten things up in the future

HTH

JIM