[sikwhiskey]

Go buy a good set of sockets for stripped bolts, tap the socket on with hammer or mallet. You want the socket on there really good the first time, even if it take 100 little taps with a hammer. Put a long flex handle or ratchet on socket. Put a bit of padding under the gun and have someone hold it steady. While holding the ratchet handle with downward ( loosening ) pressure, give the end of the handle a sharp smack with a hammer. Could heat it first to and of course a good penitrating oil like Kroil.
It's worked for me many, many times. The sockets you can buy at princess auto, napa, Canadian tire.