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JBC, that is EDM, electrical discharge machining. Works good but used to be expensive. What is the baseplate off of?




Yah, yah! That's it!!!! EDM and it was big $

The real trick to 99% of broken bolt/stud removal are the left-hand drill bits. The natural rotation and heat from drilling them left-handed really does the trick. Most of the time the part will unthread out on the drill bit just before you get all the way through the piece..