The axle is like a bobby pin, I just cut it in the middle with my Dremel round disc cutter. Because different models have different axle lengths. If there the same size for your wheel change, than that's great, don't cut it in half. You just have to find a way to pop that axle out. I use the round disc cutter and carefully take out the axle support.
Plastic base is alot easier that metal.
If you choose to cut the axle in half, this is what I do to put it back. I use JB weld putty. It comes in two little tubes and you mix it together. A little dab will do ya. The time varies according to how much catalyst you use.