After playing with the tool some more, I'm getting less impressed with it.
On the 6-bolt center section the hole that slides over the axle flange is about 1/4" too small.
However, the 5-bolt hole is large enough.
To fit the tool in 15" tire, I had to set it at 14". You can see where the holes should be. The bead clamps didn't quite seat against the bead at 14",
but it held the tire in place. Both center sections were identical with location of the holes. I didn't try the 21" and 22" holes.
I will play with it some more and decide if I want to return it. I can't understand why a tool would leave the factory like this. It's a simple matter to send the drawing
to the water or jet laser cutter to get one prototype. Then tweak the drawings if necessary until it fits and works the way they designed it.
JDarby, did you get a chance to try out yours some more?