I am trying to replace the front rotors on my 2003 Montero Sport, 2wd. I have the brakes off, the 6 rotor bolts and nuts off, but the plate in front of the rotor won't come off. I explosed the bearings and see two brass screws. Even the slightest effort to remove those screws and they began to strip. What am I missing???? How do I proceed???