evolved from Von Dutch's 2 stroke pogo stick, the Hop Rod... dangerous powered pogo

This is the first time I've seen one in person. It looks unused because it probably is virtually unridden. These things have hurt people, and the only riders that I've seen (on youtube) successfully not get thrown have been skateboarders and stunt mento see Von Dutch's design: http://justacarguy.blogspot.com/2009/12/two-stroke-pogo-stick-and-nitro-roller.html