I have also used a steel drift in the center of the bolt and a BIG OL
HAMMER! smack it some kind Hard to shock the treads, Then Use a
larger drift that does not go into the hold and smack it a few more
times Try driving in a larger Hex or torx or anything known to man to
get a bite in it and crank it out of there.
Years ago I had a socket looking thing with a tappered inside with
Teeth. Really cool thing in different sizes that you could go over
the head and Bite in that way and torque it off.
All in good fun!!

Jonce

>Thanks for all the replies, folks. I'm now down to just one outer
>bolt that is rounded and won't come out, the other one I was able to
>clean out a little more and tap the hex socket a bit deeper and it
>came out. As things turned out, I didn't have time to finish it
>today, so what I have right now are the old CV joints with the new
>star head bolts, except for the one stripped one, so I am in a good
>position to start this job again next weekend and get it done.
>
>
>
>
>Jeff Stewart