Don't have a pic but I just used a 2'x2' piece of OSB that I marked and drilled 1/2" holes for the four flange pins. Then I attached a 2x2 across one edge of the OSB and on both sides of the pinion cup to stop the rotation of the pumpkin. Worked like a charm
I have a 16 foot long treated 4x6 outside. Near one end, I drilled holes for the (5?) flange pins,
and expected I'd be able to loosen the pinion cup nut without the whole 16 foot long 4x6
spinning... but it didn't work.
After all the fooling around with pumpkins I did, I came to realize that that particular pumpkin
had had the pinion cup nut over-tightened... it was that pumpkin where I splintered my
known-to-work jig. I got the guy down at the machine shop at NAPA to loosen that one
with his massive impact.
I need to try the 4x6 again, I bet it will work for a "normally-tightened" pinion cup nut...
-Mike