Sods law. Maintanance is all part of the fun
Thankyou for the info and the warning!
I managed to get them apart. I also removed the shaft and it looks okay. The slack has gone after reassembly, so I think the shafts grub screw was loose.
Alas the motor is still running rough, so the bearings must have gone.
Are you able to get replacement bearings?
Possibly shafts as well, just to be on the safe side.