Take a look through the image gallery for Gravity Vehicle, Scrambler, etc. This one shows it if you zoom in: http://gallery.scioly.org/displayimage. ... play_mediaI've noticed that a lot of people are using a "wing nut on an axle tread" for the breaking mechanism. Can someone post of picture of that? THANKS
Basically, use a threaded rod as your axle. Put a wingnut on the threaded rod, and then use another rod next to the axle to stop the wingnut from spinning with the axle. As the axle turns, the wingnut will move down the axle until it eventually locks up and stops the axle from turning any further.