If you can twist it anti-clockwise it should stop biting into the wood with the tip, and it should hopefully just then pull out.
You might just grip it with a hand drill (if you have one).
If you can rotate it but not pull it, you might be able to hacksaw a groove on either side, to which you might be able to pull on with something like small pincers or wire cutters.
If all else fails, you could may be able to cut or grind it almost flush, then knock it in below the surface with a punch. Then leave it in and drill another ground wire hole.
Thanks for the ideas guys. I have been trying to rotate it anti-clockwise and it is a slow process....I have a little more of the drill bit extracted...but the vice grips and pliers are wearing the bit away a little as it is moves.
Thanks for the ideas Simon.....yeah the bury it idea was on my list....I think I will just try to remove it first.
Runner Up G.O.T.M. November 2020. Custom SHB-4
Runner Up G.O.T.M. December 2018. MMB-5
Winner G.O.T.M. March 2018. JBA-4
Runner Up G.O.T.M. December 2017. BG-46
We have success. Locked a set of tiny super cheap auto wise grips onto the end of the drill bit. I got about 5 to 10 degrees of wiggle in both directions. With the wiggle and a bit of rearward tension the drill bit squeaked and moaned but pulled back out of the body.
Now to fix the damage I did scratching and pulling.....bugger.
Runner Up G.O.T.M. November 2020. Custom SHB-4
Runner Up G.O.T.M. December 2018. MMB-5
Winner G.O.T.M. March 2018. JBA-4
Runner Up G.O.T.M. December 2017. BG-46
How much damage is under the bridge area?
Runner Up G.O.T.M. November 2020. Custom SHB-4
Runner Up G.O.T.M. December 2018. MMB-5
Winner G.O.T.M. March 2018. JBA-4
Runner Up G.O.T.M. December 2017. BG-46