[john walker's workshop]

jeeze, it ain't that hard. get a hammer and a big chisel, set the chisel tip in the rounded groove of the cap, angle the chisel back toward the rotor and hit it with a hammer. it will come out a bit. then hit the opposite side. it will come out a bit, repeat until it drops on the floor. the chisel needs to be long enough to reach past the edge of the rotor or you will have trouble hitting it. hell, you could do it with a big bolt instead of a chisel.