Just finished the rear bearings on my '75 550K. I drove the large bearing out first, with a large flathead screwdriver. It caused some minor burring of the small spacer, easily removed with a round file. The small bearing is easy then, using a piece of 1" maple dowel. The trick is to constantly move the screwdriver or dowel around, to keep the bearing straight as possible. Use a hair dryer to keep the hub warm, apply WD-40, and expect to spend some time at the task. It'll come out eventually.