'70 Duster Disc Brake Wheel Studs

I am replacing the rotors on my '70 Duster 340 (5x4). Pounded off the old studs and separated the hub from the rotor. Got new rotors & wheel studs (Dorman 610-130) and tried to pound the studs through. Got the studs almost all the way bottomed out on one assembly, but the other just will not bottom. It is like the end of the wheel stud will not penetrate the rotor. Had a local shop get the first assembly done, but the second just won't bottom.

Has anyone experienced this?