Hi bsa-bill,
Nope, looking at your diagram I am now thinking I may have left the sleeve on when attempting to wiggle the crankshaft up and down, I can't remember taking it off (there's old age for you).
The "engine sprocket locator bush type thing" I was referring to was actually 66-1135, I just couldn't remember its correct name.
I will check tonight when I get home from work for sure and report back, lets hope the sleeve is still on and I don't have a drive bearing issue after all.
Thanks again for all your help, most appreciated.
Regards
Brucie