I think I'm going to start selling tetherballs out of my house. I've made several of them now and I'm getting good responces. I need to get a video done so I can show how I make them. Here are some picutres of a few tetherballs I made.
Visit http://www.tiretetherball.com/ for more information on how to make your very own tetherball set made out of cement and an old tire.