I'd cut and grind the thread end to the face of the drum and beat them out with a punch,
That would be my best bet. Maybe even grind both sides if you can. The heat from grinding them off can usually be warm enough to expand and contract the metal.
Ive seen several instances where folks have welded studs onto drums, or even welded the studs onto the wheel itself. Dont ask me why, it sure seems stupid to me.
Might be worth closer inspection to see if that has been done.
Jeff
