[FlatheadTed]

With respect to all the good suggestions, I think I would be looking to weld up the thread then grind it /turn it in a lath then re thread it, you may need to heat treat it before and after .As temporary measure after tidying up the thread the best I could with a adjustable die nut, I then used a 5/8 unf nut and slit it with a hake saw squeezed it up on the axle then welded up the cut, it worked well . From the Model A venders there's a nut that does this .do a search on the A site