Tried to remove that stuck bolt? Broken off the super hardened EZ out in that sucker? Thinking now I'm really screwed? I have had success using my plasma cutter as a poor mans EDM is some of these situations....blast the center first carefully open it up to get rid of EZ out metal and then attack again with a reverse drill bit. The heat from plasma will usually shock the material enough to remove any galvanic bonds between it and the threads.
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