[FrankJ]

If you are able to get 2-3 turns on the remaining stud, what you are currently doing is the best technical solution. I am not a good one to say if it is legal. Strap the wire down so the stud is not taking any stress from the cable. A good idea in any case.

If you try the drill & tap method, I would go with a M6 (metric) tap to be consistent with the other post. For the final hole depth use a drill bit with the flattest angle you can find & a drill stop. A regular taper tap will probably be useless. Start with a plug tap & finish with a bottom tap. I would use a drill press to make sure everything is square. (Obviously do not use power when tapping, just turn the chuck by hand.) Find the most OCD person you can to do this.

When this happened to one of our boards, I just ran the negative to one of the Wago 40 amp terminals & demoted it to a test board. This would not be legal for competition