If the part is worth a lot of money, there are techniques for rebuilding shafts and bearings. If a source was available locally, I would have bought a new shaft, and machined flats for the set screws. You can get bearings like this 'spray welded' or machined out to make room for a ball race. But the very used mixer is not worth all that much, (I just bought an exact copy for $100) so a few hours work and $10 worth of epoxy makes sense - I just hope it holds up, due to logistics 2 mixers will be handy, we are putting one on top of a wall to save lifting wet cement 8 ft., the other is mixing mortar for a rock wall in the living room.
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