Thank you peeps yes I like that pokata sound myself it sure does attract attention when I pull it out front. I have a sidewalk out front that leads to new subdivison down the road and the peeps use it for recreation..I can tell ya they either smile and stare or walk faster...

This concept needs to be rebuilt but vibration works great and yes I want to make one for worm castings since that is on my next "projects" list (wife just let's me go now days). I thick a PVC version would be good? Light weight but strong and maybe 2" pipe for framing. I love PVC there is no limit to what you can do with it.

Believe it or not the idea came from all those years of seeing steam shows with banging engines and hit-miss motors going plop bang wishhhh pop!