I know we answered the original question a while back, but continuing the drift a little, the place I did my tailwheel had a training aid - a smallish 'bmx' wheel mounted on a handle (one of those big 'pegs' the youf of my time had to stand on and do tricks).
You held the handle, the instructor spun it up, make the pitch change via the handle. I thought it was very effective both in cementing the idea of procession, and the suprising magnitude of force from even a small, light wheel at low speed. What a big prop tries do do to the crankshaft in tumbling flight must be pretty impressive..