Koolaidman - i think you're talking about the little wedge in the back, right? All that is is a wegde of wood with a handle on it. The actual potato cannon is 46" long consisting of 13" of 3" PVC and 30" of 1.5" and then of course the end caps and adapter adds 3".
THUNDERLORD - Yes the ball on the back is attatched to the end cap. My G-pa turned that on his lathe. Yeah, he's a pretty cool guy. And what's funny is that he suggested making the cannon inthe 1st place!
