[quote author=JJEJ20BAT link=topic=40259.msg459074#msg459074 date=1389192069]
If you got a hole saw bit just a tad bigger than the stud,would it be any easier?at least you could use the stud for guidance instead of trying to keep the drill straight going through the centre..
[/quote]
I was thinking that as well but local hardware store didn't have one long enough in the right diameter.
Stubborn ba*tard of a yoke anyway. Left the studs hand tight and went for a spin. Checked them when I came back home and they needed tightening but the broken nut still hadn't snapped. There's fook all left and it's still not budging. Bought a couple Bosch and draper bits and I've only one left.