Step 1: How To
You just need a decent sized nut and a good, thick rubber band. Thread the rubber band through the nut and then loop it so it is attached to the nut. You are done! Just take the front of the rubber band and put it over your finger like a classic rubber band launch and pull the nut back and release.
BE CAREFUL! IM NOT RESPONSIBLE FOR YOUR ACTIONS.
Step 2: Have Fun!
Have fun, but be careful!