The spark eroder man beckons everyone who used crap (or the wrong size) drill bits and/or chinoisery extractors. Stahlwille are the champs for the last resort of extraction. From the really low rent ones I remember the harmless apparently lead based ones that ended up like ornamental scrollwork to the ones that did not betray their extreme brittleness until they became a more difficult to solve problem, cue Mr Spark Eroder.