problem on the right side door pillar adjuster!

Hey guys was working on my 69 ply. valiant today on the right door.. notice the door and quarter lines was off by a 1/2 in to inch went to do the door pillar adjustment and it was loose very loose in the pillar was rounded out big time!! couldn't even get the thing loose it just spins around and cocks sideways my question is how would you guys repair this? the hole where that goes is ovaled out.. and the nut on the back side is busted loose?