This works fine in theory, but theory breaks down when the bearing involved is the original, with failed seals. Pump full of grease, insert shaft (in this case an old input shaft I got from a broken gearbox), hammer, and wipe grease from your face, clothes, tools and workshop. Plan B: Use something with a much higher consistency, like chewing gum or bodykit (the "sausages" you use for sealing fenders, not the pump type you'ld use for seams), instead. Worked like a charm.

On another occasion I didn't have such with me, but found a suitable iron rod with a 90 degree angle at one end, and a flattened part with a rivet at the other. I think it came from an old lawn mower. The rivet grabbed behind the bearing when I inserted the rod into the bearing. Had a mate hold it in place, and using a heavy piece of pipe I found nearby I hammered out the bearing (which obviously wasn't intended for reuse). In short, use whatever junk you have around, and improvise.

Bram