If its anything at all like the toy CVs, wedge something between the plate and the diff, and hit it with a BFH. Or you could open the diff, and tap the end of the axle from the inside with a big screwdriver and a hammer, it'll come right out that way as well. You may wanna try rebolting up those bolts, and just pulling hard on it, it may pop loose.
I'll be doing this tommorow, so mabye then I'll have some better suggestions