Thanks for the pictures. On mine the protruding part of the pipe was less than half of that and had no angle on the end.
The good news is that I've managed to get it out without drilling it. A combination of heat, cold and a good twisting with a screw extractor and eventually out it came. Before that the ball bearing popped out together with what looked like a combination of a spring and silicon.
Anyway, I've ordered a new one. In the meantime I will get on with some other bits and pieces including giving the engine a good clean and polish while I've got it on the bench.
One other decision that I've got to make is what to do with the wheels. The chrome on them has some rusting and the spokes are pretty shabby. Any recommendations welcome.
Thanks for all of your help.
Cheers
Phil