But it was unbelievable: The extractors of all sizes starting from very small and getting bigger (with the bigger hole sizes) all had a very good grip, but the bolt-remains would not budge. I did not want to break the extractor in that hole. Initially I thought I would not drill bigger than 5mm, but it was not use: I had to go on to 5.5mm, 6mm, 6.5mm and even 7mm. It is obviously very important (and difficult at the same time) to hold the drill ABSOLUTELY straight. Else, I would drill into the t