Thread extractors do work.... It's knowing when and if to use them You have to drill out the thread until you can get 3/4 of the extractor biting or it's no good. And it won't work on severely corroded studs as their chemically bonded.
LOTS of heat helps. More than people believe. Forget propane. You need MAP gas. Not expensive from Screwfix etc.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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