I was going thruogh the site and I saw all the different things that users have made out of knex. Guns, Cannons, grenades, stands, ext. One area that I thought was laking was the knex cars, the ones that had motors couldn't steer and the ones that could steer didn't have motors.
I hope that this Instructable will help bridge that gap... Then again it would be cool if sombody could mount a gun on this thing... :)
Step 1: Drive Wheel
I did spend a good amount of time on this and if that little thing bugs you then either change it on yours or just stop reading.