Just spent 5 hours... attempting... to drill out a broken bolt in my rear strut mount of my sport car. Failed miserably.
I've tried right handed drill bits with penetrating oil, left handed drill bits with penetrating oil, several extractors
including the famous "Grabit" extractors. Everything failed, miserably. The Grabit extractor actually slipped out of the
drill.
Either the drill is very weak, or maybe I'm doing something wrong.
And yes, I reversed the drill for the extractors and the left handed drill bits.