Otherwise glue a _stud_ in there with JB Weld and put a nut on the top.
But this is a bodge.

But I would do that with LockTite.

Not in a stripped hole - you'd need some gap filling too.

Well, as my son describes it, I 'Hardy-boyed' it by making a stud, gluing it
in with the JB Weld, and putting a nut on it. It is solid enough to hold
the end of the bracket in place, all the force is shear, so I expect it to
be just fine.

Thanx for all the help!