if you have a dremel tool, or a small hand held motor tool you can use a cutoff wheel to slot the inner race of the bearing. I would go slowly, and stop before you go through all of the way to protect the spindle. once you get a slot into the race you should be able use a cold chisel, or maybe even a straght screwdriver to break it open, and then it should be easy to pull off. If it is still difficult you may need to make a second slot.