The I have found a few videos regarding removal of broken fasteners and thread repairs, etc.
If you have any other hints and tips, please share.
Thread Repair.
Thread repair.
To Remove a Broken Bolt
To remove an inner bearing race. Just be a bit more careful than this guy and don't mark the shaft with the grinder as you will seriously weaken it.
Heicoil spark plug thread repair.
Effective but expensive. broken bolt / stud removal.