Well, that was a real dog's dinner.
Lesson 1: I wish that I had just left the thing in and re-greased it.
I knocked out some of the needles but still couldn't get the bearing body to shift. All that happened was that the outside lip bent out. So I knocked out the big bearing on the other side, thinking that it would then be easy to knock the roller bearing out from behind. Took out the long spacer and hammered like crazy at the washer in behind the needle roller, trying to push the lot out. No movement at all. The only thing that happened was the washer got cupped. I was hitting so hard that I was worried about damaging the whole drive casing.
Lesson 2: now I know that the washer doesn't come out. It's captive in the housing. I'll have to settle for now having a mashed washer in there for good.
I eventually got the bearing body out by chipping, cutting, breaking. Really messy and it took a long time.
I put in a new bearing and a new inner sleeve, one without the little hole in it this time. The sleeve doesn't rotate easily. I hope that I haven't damaged the new needle roller when putting it in. I suppose that I'll have to get a new big bearing too, rather than put the other one back.
All in all, not a great success.
I'd like to hear how others get this bearing out – and I'm sure Nogbad would too.