I think Marty has got it. I am going to try this tomorrow. Remove the rubber plug, turn the rotor till you see the adjustment wheel, put a screw driver in and turn up or down till you tighten the shoes for the parking brake and the rotor should fall off. I seen this plug but it falled to register what it is for. If you look at your new rotors you see this hole which is not threaded which means to me that it is a plug that goes in there, thus the rubber plug for the adjustment access for the brake shoes. So I think it goes like this. Remove tire, caliper, loosen parking brake adjusting bolt, remove plug, turn wheel till adjuster is lined up ,tighten brake shoes, pull off rotor. I think we might have a winner. This is what I am going to do tomorrow.
Lets keep in touch guys till we get it.
Have a good night
Bill