Not really resolved yet. Can you feel any side to side play in your
arbor. It's easier to feel with the belts off. I clearly have .005"
of play (put the dial indicator to it). It seems like if I tightened
that right side arbor nut it would take-up the play, but getting onto
that nut is a bear. A 7/8" socket is too small. I guess that
suggests 23 (rare) or 24mm, and then it's unlikely I can clear the
walls of the spanner nut -- which means likely that needs to come out
first. I tried an ajustable pin wrench, but that's not going to work
in amongst the trunnion assembly -- not space to navigate. The 1/2"
sockets I have are too "thick" to fit. I have yet to find a 24mm
3/8" socket.