Gavin207

i had a similar problem, except in my case the bolt was missing completely. Because the shoulder bolt isn't available on its own, my solution was to make a brass sleeve to slide over a standard bolt to replicate the shoulder. That was a couple of years ago and it's worked faultlessly since.

on drilling out sheared bolts, the best way i've found is to start with a centre or slocombe drill - has a small point but is very rigid so is easy to centre and keep in place. i've used this successfully when drilling out sheared subframe mounting bolts in stages, and finally cleaning out the remaining threads with a tap - takes time and patience, but worth the effort.