If you've already drilled ,and now have an easy out broken off in the hole,you don't have alot of choices. You can use acarbide tipped ball as has been previously suggested and try to go after it that way which will use up several of them,but will work, and as a last resort [I do it often,but I'm nuts] put your smallest cutting tip in the old gas ax, set gas at 7 lbs,oxygen at 40lbs ,with an 1/8 inch flame ,heat the easy out til you just barely see a puddle form,and give a quick blastof air, go slow,repeat go slow