Ugh . . Removing a 6-bolt rotor. Bolts were stuck. Sprayed with PB Blaster, and 4 of them came out. The other two rounded.
I realize now I should have slotted them with the Dremel, but I drilled them out to remove the rotor. Now the studs are still in the hub. I can’t get them with the vice-grips — not enough of the bolt is above the surface. And I don’t want to use the dremel now for the same reason.
What’s next? I sprayed with more PB Blaster in the meantime. I’m thinking a reverse drill bit and extractor is the next thing to try. Any other suggestions?
Weld a washer to the stub (using MIG or TIG) then weld a nut to the washer, give it another shot of lube and unscrew carefully.
Otherwise if you have no luck with a 4mm left handed drill, drill it out with a 5mm drill, and then fit a thread insert (Helicoil or similar, they will specify the exact drill size to use).