The frame looks to be a steel one, is this right? I think the extractor you first tried had a left hand twist (the twist type usually are to both deepen the extractor's engagement with the bolt as well as unthread the bolt during use). So a left handed extractor might be misleading, as I wonder if you mean a right handed twist?


I would further using increasingly larger drill bits and try to remove as much of the bolt as possible. If you are able to keep the bits centered eventually you'll end up with just the threads left (from the bolt). At this point you can run a tap through and it usually will pick up on the existing threads and remove the bolt's thread remains.


If worse come to worse drill through and use a bolt long enough to use a backing nut. Either way you go I would go through ALL the hardware on the bike, ALL the threaded and clamped fittings on the bike and remove, clean and lube before more corrode in place. You have received a shot across you bow. Andy.