Take a Walgreens Cotton Swab, cut one end off, put a little dishwashing soap on the end and shove it into a wheel. Bend the swab at the wheel just a little, little bit. As you turn the shaft the wheel will go through all positions. The racer will then understand why you are setting the particular positions for the rear wheels and the Dominant front wheel.
Ok, I know you can shave down the end of the cotton swab called Q-tip. I just happen to have 500 of Walgreens swabs and here's the advantage. You can have a model of the set up at your Workshops along with a box of Walgreens swabs. The racers already have wheels. They can make one for themselves and play with it. This could be demonstrated during your Presentation talk.
Have Fun, Everybody.