This wiil shoot shishkabob skewers through 3 layers of cardboard and into wooden doors! Very simple and powerful only 2 parts rubber band and paper binder / mauly clip. Don't shoot at people or animals!
Step 1: Step 1
Wrap the rubber band around the handle of the clip 3 times then stretch it over one end of the tube like the pic.
Step 2: Fire!
put the skewer into the opposite end to the rubber band, grab it pull back and release! Blam!