Jools you are a legend.
Thanks mate.
The parts manual shows the same type of spacer tube (with fins), and I can see the slot, so I'll try to tap the bearing out. There are also what the parts manual refers to as vibration dampers (5 of them) in the wheel, I guess they are bushes I can tap out too?
Whilst on the subject of powder coating, do you reckon I should get the sprocket carrier coated at the same time? It'll mean the removal of more bearings and bushes!