Jim Wilkins wrote:
"Jim wrote in message
...

Maybe if you could wedge the nut away from the ball the threads would
bite?
jsw

I imagine that the nut is now riding on a gravelly
bed of metal shavings. The lock washer is still fully
compressed so I don't have a gap to place a chisel.

Secure the ball from rotating with Vise-Grips, jack up on the screw and turn
the nut.

Could be. That compressed lock washer is probably
providing a lot of force axially so I figure if the
nut was going to engage and unthread, it would have
done it by now. The nut just turns and turns with
no movement along the stud axis.

--Winston