Here are instructions for a small knex element called "The Rolling Wheel".
You can watch the video above (9 New Knex Elements) to see how it works.
Beware, You'll need to cut some tubing to build this element.
Make Sure to check out Step1 to see what special piece you need to complete this build.
Thanks for watching/building,
Step 1: Special Piece You Need:
You'll need 10 of these