don't be afraid to put some real force into moving the whole assembly that the rotor is mounted to. make sure you have the vehicle properly secured, and get a friend to help you man-handle that crap back together. it is actually really easy to take apart and put back together. but by easy i don't mean that you can move it with 1 hand. get a jack stand under the vehicle securely, and then use the jack to slightly move the assembly up and down until you can man-handle everything back together. there really isn't anything to it other than force.