Didn't Mark say he uses electric rings?
He did. But I don't buy e Props, so I don't have any.
Plus how in the world do you use a piece of fuel line to center a prop? I see the pictures on APC web site but I totally don't get it.
Kind of hard to see, but like this:
As a bushing. Granted, this picture is 1/2A, but it worked, just shave it flush with the back of the hub and screw it onto the crankshaft. The tube guides it on straight and the nut clamps it down.
That's likely to take some trial and error. Just use metal tubing. Those scrap packages like I posted earlier have every size and they all fit inside and outside each other and you can stack them to combine and form any ID/OD combination you want. All without cussing. Then a drop of CA and belt sand them for the right depth.
Rusty