Originally Posted by Cynikal
Try melting wax in the allen hole. You can get it out at home but it's a pain in the arse on the street.
Wax (or glue) in the allen head of a quill stem? That WOULD suck to get it out.
I'd chalk this all up to a very determined thief- probably nothing would have stopped him- particularly if he took the entire headset. The guy obviously knew something about bikes- which makes it all the worse.
You could get a ghetto fixie where all the parts are seized together... I to free a fork from one of those with a hack saw!