by Warkton Tornado No.1 » Wed Jul 11, 2018 11:34 pm
It shouldn't be impossible but you do need to be methodical. The trouble is that the sheared face will be even harder than the material was originally.
It may be possible with a good, sharp punch to tap it around, as there is no load upon it (unless the bolt bottomed out like the MBD one I bought once.....) Hopefully, it was just an Indian bolt, which I would never recommend using over a 'proper' type.
Failing that, drilling using a small, sharp drill bit @ slow speed with copious cutting fluid may enable you to gradually increase the hole size until you can extract it/remaining threads collapse inwards. If you possess a die grinder or Dremel type tool, you may be able to give the drill an easier start by getting below the work hardened surface, but you'd need a steady hand & good, small grinding points.