I think the tube is the way to go. It a few minuets before 11pm and I just got in from another 17 hour day. I brought my ESC, Nippy, and Li-Po's to work this morning because I didn't have any soldering tools at home. I melted everything together but didn't bring a Receiver or TX to test the motor out. First thing in the door I plugged the ESC into a receiver flipped on my 8103 and spun the motor IT IS SO COOOOOOOOOOOOOL. This is my first brushless set up and I am really impressed with its operation and performance. I drilled out a 10.4.7 GWS prop and fished a rubber band through the motor holes. I then played with the throttle spinning it at full RPM and getting the prop to rotate at really slow speeds. I like the tiny high pitch noise it makes when you plug a battery in.

The torque is surprisingly noticeable. I can see how the tube idea will be beneficial over the wood disk. The larger contact point of the tube spreads the !QUOT!contact patch!QUOT! which efficiently distributes the load of the torque to the airframe. I had a Physics exam tonight, can you tell?
Here is tonights question; how do you correctly rout the rubberband that holds the prop on?
I'll snap a photo of my setup you have to see my goofy rubberband job

Whack!