Rod,
I think I noticed the tooth hub. I will look to see if the rotor has teeth also. I did not wipe off the rotor.this time. It looked clean and dry and they were sealed in plastic. But I usually do clean off new rotors. I guess I will check the slides and clean off the rotor next.
The rotor seemed to seat around the hub lip and I tightened the wheel by hand. There is no wobble or vibration. Thanks Rod.