Troubleshooting and Installation Tips...
Installing Rotors
There are times when the rotor won't go on the studs because the studs won't line up with the holes in the rotor. In most cases the studs aren't completely straight. Note the direction the end of the stud needs to go. Put a nut on the stud (to avoid damage) and hit the nut with a hammer. Keep doing this until the rotor slides on without forcing it.