Removing knackered allen bolts

[the stag]

…rescued another bike from the tip today – anyone got any ideas how to remove an allen bolt from the stem, that has worn away inside and the key is just spinning in there?

Thanks for your help

[kdw712]

If you can get a dremel in there what about grinding out a slot to get a flat blade screwdriver into
or grind awway the entire bolt head  - i had to do that with XCii and the hex head cage bolts

[the stag]

i like the slot idea - good thinking - will give it a bash when i get home - thanks very much

[kdw712]

can't beat grinding a nice slot   

[theRuler]

get a slightly larger splined bit and whack that in

[theRuler]

the spline tool for undoing vw drive shafts is just a whisker over 6mm.
get one of them!

[sonic-1]

i to use spline drive hamered into the wrecked allen head