[special-K]

Thanks for more offerings to check out. Left hand bits are the greatest for drilling out a broken bolt shank. I bought a set to do this originally, because my old set was nowhere to be found. But they are poor quality I'm sure, came from Harbor Freight. I'm using a RH 1/8" bit for the pilot. I bought a hinge pin screw centering tool that fits, a bit loosely, into the hole the bolt is broken off in. I removed the 1/8" wood bit, ground a flat spot on a high speed steel bit, and inserted. But it's not cutting it. Tried a cobalt bit, no better. I have had great luck using LH bits on broken bolts. They have brought the shank out w/o need for an extractor. I don't think I've ever tried an extractor that didn't break off. This bolt wasn't ceased, so should thread right out once I get a purchase on the shank