Take em off the kart and I just spin the wheel with my hand.. its not too safe to burn prep in on the kart. If your just per race wiping on the kart is fine.
I'm planning on building some this year,and thinking of marketing them.I was just seeing what kind of interest there might be,if people used them or not.if everything works out I will be able to offer a 3 piece stand that ships and stores easier.