Hmm...couple of things here...
1_ I wouldn't apply heat to the bearing. It will expand. To place large bearings in mining equipment (10kg and over) we used to keep them in the freezer for a couple of hours then
drop them in place. Besides the inside of the RA shaft is some kind of very soft metal, likely bronze..
2_ Very easy to get a bearing out. You just need to tap it gently. As long as it's square to the tube it's fitted in it will slide.
In the worst case scenario if the bearing is sticking to the walls you can use a small press to
crack the seal but my guess is that a few gentle taps will dislodge it. Then it will move.
Just get a long threaded rod from Bunnings or other hardware store, let's say 500m long, M14 and two nuts. Cut a little piece of steel that would be just a bit under the diameter of the bearing and thread it in the middle with the rod attached. Then all you need is a heavier piece of tube (mass) to hammer/tap against the other nut. You'll get it out no problem.
If this still doesn't work there are a number of tools to remove bearings that you can find in any automotive mechanical shop.
Good luck.
