Unless you are replacing the rotors, there's really no need to remove them from the hubs. Saves you a ton of time by not having to mess with the rivets.
Also, when the rivets are "set", they swell into the holes, which is what makes them a little tough to get out. They are installed from the rear, and then a huge press mashes them flat. Once you drill the head off of the front side, the body of the rivet is still swedged in the hole. The thing to do is simply drill the heads enough until you can remove the rotor from the hub...and leave the rivet in place. Then, if you must, you can press the body of the rivet on thru the hub.
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Joel Adams
C3VR Lifetime Member #56
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"