I'm not even sure this is relevent or not, but I ran into a bit of a weird set up on my new missions, and it may be the same type of thing that you've got.
This is not your typical axle type set up where the bearings slide onto each end of the alluminum spacer, and then the axle(bolt) slides throught the whole assembly.
The system I now have uses larger axle bolts, and no aluminum spacer, only a plastic spacer that floats between the bearings.
A normal bearing "pusher" will not work on this type of set up due to the fact that it is the same size as the axle it's self.
What I do is take an "L" shaped allen wrench and poke the angled end of the wrench half way through the wheel/bearing set up so that the end of the angled side of the wrench is even with the middle of the spacer. You should be able to feel the spacer move as you begin to pry out on the straight end of the allen wrench, giving you a "bite" on the insde edge of the bearing. The bearing should pop out with minimal effort. Once you have one side out, do the same to the other side.
One thing I've found is that it can be a little tricky lining the floating washer up to slide the axle bolt through the frame/wheel/bearing assembly
Like I said, I'm not even sure if this is the set up you've got or not, but good luck anyway!
