Originally posted by mohrt If a pipe wrench won't fit, weld a regular nut on top of the stripped lock net, remove as per usual.
Originally posted by mohrt OK more ideas:
* Try using locking pliers, or vice grips.
* Try a faucet pipe wrench
* Go find yourself a special "extracing" socket, they make them. They have teeth that bite into your stripped socket for removal.
* Use a rotary tool with grinding edge to re-create the sides of the nut, see if you can get a wrench on it.
* bust off the nut, replace the stud.