Important! : Help needed quickly!!

  1. #1
    Ive been trying to sort out the banging noise from my rear arb and have snapped a bolt in there I'm going to go buy a removal kit in a minute, I understand you need to make a pilot hole first what I need to know is
    1. What size pilot hole do I need for a snapped m8 bolt?
    2. Once I have the pilot hole and get the removal peice in how do I get the bolt out of the hole?
    3. Will the thread after I got the snapped bolt out need tapping?
    Please help this problems doing my head in now, I'm going to have to replace the end plate bolt two as now I've removed it twice it won't tighten up again.