Factory disc brake rotor question

Swedged studs look like this. You can see the difference on this one rotor. If you can't see the hole or countersink, then the rolled swedge on the stud is covering the countersink or holes in the hub. See the left stud has an incomplete swedge. Compare it to the stud on the right with a complete swedge.





Here you can see a new installation with new studs. You can see the hole and countersink in the hub.