Factory disc brake rotor question

4spdragtop said
Everything I got is used Rob, no new stuff. I see now the splines run into the hub, stick out of the rotor a tad. I've read several threads about swedging.
Studs slip right into rotor that I sandblasted some. Shoulder I'm pointing at is a nice fit, but no press needed. Now to go into the hubs, I would say I will need a press.

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There was a reason for that step down in diameter also. If a spline in hub failed, a stud with oversized spline was available. Hole in rotor did not need to be enlarged to install.
New rotors may be coated which puts an end to the rust. You might have the hubs blasted and coated too.