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I've had the best success with left handed bits by first drilling a small pilot hole using a conventional bit. The left hand bit then just follows the pilot, hogs out a bit of material and hopefully backs the stud right out.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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