Joe, hate to contradict ya, so I'll just magnafy
the pic , the threaded end of the stop stud is held by the lock nut on the left, and it's screwed into the steering 3rd arm [part 22],
not the axle end/kingpin housing
on the TF trucks the stop
is adjustable and don't reguire any fiddling, just a pair of wrenches, and prolly some pb blaster or such
Bill