"Derek Raycraft" <derek.raycraft@sitraka.com> wrote in message news:3D3EF72F.90203@...aka.com... (...) Agreed - it has to be a tenis ball or something with some mass. Otherwise it'll never fly. A tyre off a technic wheel won't work well at all. I (...) (22 years ago, 24-Jul-02, to lugnet.org.ca.rtltoronto)