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If you break an extractor in a bolt or stud fragment that broke off in aluminum, then nitric acid diluted to 30-35% will come to the rescue. It corrodes carbon steel very well and the higher the percentage of carbon there, the faster the reaction, but it does not corrode aluminum at all. And this method can be used to etch a fragment of an extractor or a broken drill or a fragment of a stud or bolt, but only if it (the fragment) is not made of stainless steel. (Advice from user Max Payne, I have not tried it myself). An extractor for torn off fasteners is a very useful thing, but unfortunately it does not work as it should. Instead of a brilliant way to unscrew the remains of the fastener, you get a headache, or even a damaged part. I explain the reasons for this discrepancy in the video