22-08-2020, 01:08 PM
When it comes to head studs clean off the tops of the broken studs if they are projecting to give you a flat face to drill into. Put a head on the remaining studs for location. You then have a good guide for starting to drill into the broken bits. You can start by marking the broken bit centrally using a bit which is just clearance in the guide hole, take the head off to see whether your mark looks central, then put it back so that you can see you are drilling down the centre of the guide hole with a smaller bit, and work up in size as you did for the side water joint. If your mark on the broken stud was not quite central adjust it with a centre punch.