E-Z out's to remove the broken stud. They've never failed for me. You can get a Heli-coil kit ant most auto supplys. I always heli-coil the front stud holes and upgrade to 8.8 grade studs all around. The 6mm heli-coils use a 1/4' bit to drill out the existing hole, and the kit comes with a device to screw the heli-coil into the new hole. The coil is SS and threaded for your 6mm stud. Hey, I think they're great...Steve