Broken Pinch Bolt Help

[mkb]

Started working on changing the CV joints on my 99 A6q over the weekend.  Was trying to get the upper pinch bolt off which I think holds the upper control arms onto the hub housing.

Anyway, I'm on the drivers side, I've removed the rotor and was trying to remove the upper pinch bolt.  It's real hard to loosen.  I'm thinking of soaking it with PB Blaster, but nah, I'm an idiot.  I take a breaker bar to it and slowly try to loosen it.  And then the bolt head just breaks off.  Arrgghhh.  Why didn't I just soak it overnight and try again in the morning?  Why?

So now the pinch bolt is still in there with one end sticking out (about 1 1/2") and the other end broken off.  Any suggestions as to how I remove this?

I'm thinking of attaching two bolts on the end with the thread sticking out and try to loosen it that way.  Anyone know the dimension of the pinch bolt?

Any other ideas before I screw this up completely?

thx

--
mohammed
99 A6 28q avant
97 A4 18tqa