Not so dumb; these bearings are turning out to be deceptively tricky.
You maybe knocked out the bearing outer races without first seeing that the piston ring-type things are placed immediately next to them. They aren't for locking anything but seem to be spacers to keep the seal slightly away from the bearing. When re-assembling, they go back in straight after the new outer race/shell/cone and before the seal is fitted.
I'm about to start tightening the big nut and against my original view that this wasn't needing to be very tight I now see that it probably needs to be extremely well tightened.
I'll keep you posted unless you do it first, in which case, please advise me:bang: