I highly recommend you get a service manual !. those things are very odd to take apart, and if you break the magnets ?, your screwed !. what little I know of them, is the large pinion teeth come out that end. it's pressed in from that end. I have not taken one all the way down, as I did not want to waste time on messing with something that was broken beyond fixing anyway, so I just bought a good used one back then.