My reply didn't appear on my screen, so I've put it again in a new post.
Quoted message said:
Many thanks for that. I think there may be both a cup problem and a
missing dust seal. Mine is more like the one here -
http://bernd.sluka.de/Fahrrad/Shimano/TM/FH-MJ10-6NT_1994.gif
Right, I've put some pics here -
http://s163.photobucket.com/albums/t282/shazzbat3/bike%20stuff/
I'm now not convinced that the cup for the bearings is there, there's
certainly far too much room for the balls and the cone.
Steve