One of the studs on my head broke in which the manifold goes on to. Ive tried various stud removing kits and none of them have seemed to work so ive decided to just drill the whole thing out, and retap at a larger size. Now i bought a drill bit from grainger(# 5xm50) and its just the wrong bit for the job and is not doing the job. could anyone suggest another drill bit that isnt $30-40 that will drill out this stud?