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Driller failure. I recall seeing a YouTube video about how bearings are made during which I think I saw that the shells are case hardened. That might explain why my drill didn't touch it. I am now experimenting with a Dremil and a 15mm x 0.5mm disk a bit like an angle grinder disk...

I just had an idea - drill it to reduce the mass and then maybe the chisel will work. Providing I do not damage the housing where the seal fits. It will not matter if I accidentally drill into the main bearing housing a bit providing I do not puncture it. Off to play with a drill ;-)

Heat - It is a plastic casing with a steel insert - the heat will distort/melt the housing. The bearing outer shell is inside the steel tube in the casing so heating will make it expand and tighten. Heating the tube might work but probably damage the plastic housing. Hammer - I used a 7lb...

Cakeman - Thanks for the instructions which helped me get started on this. The machine is now an organised pile of bits. The inner bearing and seal had totally disintegrated and made a complete mess of the shaft as well. I have managed to remove the rear bearing, inner seal and remaining...