I grabbed it with a pari of vice grips. The threads that I ruined were exposed anyway. Tightened it up the same way.
Some people have welded a nut onto a bolt that fits, but that didn't work for me.
THE Conventions of a number of the States, having at the time of their adopting the Constitution, expressed a desire, in order to prevent misconstruction or abuse of its powers, that further declaratory and restrictive clauses should be added: And as extending the ground of public confidence in the Government, will best ensure the beneficent ends of its institution.
I haven't done it yet and if I'm thinking right it takes an allen wrench. Correct?
If yes then you just get the appropriate L shaped allen wrench and cut the short side down with an angle grinder.
Don't get it too hot or you will remove the hardness, dip in water to keep it from burning.
Hope this helps.
I made one with 1ea 17MM x 1' bolt and two hex nuts. thread the first nut to the bolt head then jam the second nut FIRMLY into the first. Insert the bolt head into the drain plug, then put a wrench on the FIRST hex nut to remove.
I did this several months ago, and I'm going by memory on the 17MM. I'll double check and see if I still have it. I'll mic it and post a pic.
I also seem to remember wrapping foil around the exhaust for easy clean up.