When you need a tumbler now! I did and cobbled this together from what was in hand. It worked just fine. Used feed corn as the media to deburr PVC parts cut from schedule 40 pipe.
I donated because I use it almost every day.
Wikipedia is something special. It is like a library or a public park. It is like a temple for the mind. It is a place we can all go to think, to learn, to share our knowledge with others.