Hi guys need a bit of advice. i was putting the car back together today, went to put the water pipes on the turbo and noticed the threads were rusty, so i tried cleaning the threads with the water banjo bolt and went in a bit much, when i came to undo it the bolt snapped in the thread, tried mole grips and had the gas on it, it's in there well tight, i thought about drilling just shy of the thread and then try and tap into the exiting thread, is this a good idea, also i noticed my mate took a very very tiny notch out of the corner of the exhaust wheel blade will this be all right. Had a crappy day with this.