etpm
Veteran Member
One of the reasons why the left hand drill bit works sometimes is that the hole being drilled allows the bolt to shrink a little in the hole. So it can really help if the drill bit is as large as possible because it makes it easier for the bolt to collapse a little.For the next time buy a few reverse twist drill bits. I don't worry about the size too much I just keep a small, medium and a large one (3/8") laying around. You just start drilling in reverse and once you get a little ways into the broken bolt the bit usually grabs and just turns the broken piece right out. It can save a lot of hassle but don't break the bit off in the hole. Then there are more problems. It's fun watching the faces of someone who has been struggling to remove a bolt when the bit grabs and just spins the bolt out!
Eric