Thanks proptech I shall keep them in a safe place and note down what safe place so I don't go searching in the garage muttering 'where the hell did I put those &*$)**? extractors. My apologies for being late in thanking you. Greengrass
I have only ever once had a success with these. What happens is, it's far too easy to snap the extractor off leaving a hardened piece of steel that can't be drilled, stuck in the stud and it eventually takes far longer to sort that out than if you drilled the stud and re-tapped the hole in the first place!
They are not that strong, and unfortunately, there is no warning that it's about to fail. Just "snap" and then %&?@.
They were ofter referred to as "easy outs" but as stated above it wasn't always easy to remove the stud. They are left hand taper-taps. Always use the biggest size that goes in comfortably and don't drill the biggest possible hole in the stud even if it is done without drilling away its threads because you must retain some strength in the stud or it will snap off. Drill diameter chosen is a compromise and a matter of judgement.