On a related thread. He drilled it out and put in threadserts.
I just recently stripped my 8s outcast bulkhead which was a doozy of a repair, saw some dude on reddit posted these pictures about using nutserts to fix it more aggressively without buying aluminum bulkheads. I just got new bulkheads on jennys but I'm gonna give this a shot to the one I pulled off and if it happens again give this a go.