I accidentally busted off a valve cover bolt in my car engine. It broke off a good quarter-inch into the hole too. Some silicone lubricant, this extractor set, and a bit of patience saved me an expensive trip to the auto shop.Take your time to center the drill bit on the busted bolt; use a center punch if you have one. Step up from smaller to larger bits if you need to and use oil or lube to keep the bit cool. You can keep trying so long as you don't mess up the threads in the hole (unless you're good at tapping holes, in which case you probably already know all this stuff).
Rating:
[5 of 5 Stars!]