+1 ON THAT pull it apart take it to someome will a milling machine ,if the easyout is still in there you wont be able to drill it with regular drill bit there to hard.carbide end mill is the way to go now.Being a machinist, I'ld say it's next to impossible to accurately drill the bolt at the root of thread diam. without hitting the threads. Ok to go in smaller and use an easy out. If you are trying to open the hole up to the root of thread, needs to be done with an end mill. If you already have a hole drilled for the easy out, the next drill size will follow it. Better listen to Sweat. Good luck
If the easy out is still in there, you'll probably need to die-sink it out. You won't get through HSS (High Speed Steel) with a carbide drill.+1 ON THAT pull it apart take it to someome will a milling machine ,if the easyout is still in there you wont be able to drill it with regular drill bit there to hard.carbide end mill is the way to go now.
I'd bet it would cost whatever the shop minimum is, at least it works like that around here. I've had the machine shiop near my place remove a few bolts for me and it's usually $15-25 depending on the guy's mood I guess.You have to judge your own skill set and confidence against the job - taking the clamp to a machine shop is a very sensible suggestion. It shouldn't even cost that much to do.
it can be tough to find left handed bits. I had to search high and low around Austin and finally found a specialty tool shop that carried them. They weren't cheap either, like $4-5 each for 2 small ones.I like the left handed drill idea, I've never done it that way but I bet that could work out very well.
dont think i said a drill i said a end mill .you can ether use a hollow mill and cut around it,till you get the esay out out or take a small end mill and go around it .There are some things you can do with a mill you cant do with a drill.If the easy out is still in there, you'll probably need to die-sink it out. You won't get through HSS (High Speed Steel) with a carbide drill.