John a guy you may know had one of them, his name is Noel (the jeweller's son), another Bendigo lad. He seemed to think his was a good thing back then.
The closest I ever got to it was when he ran me over with it, leaving knobby tracks from the tip of my Rossi boot right up over my helmet after a "faulty air pressure gauge" incident.
Would have been about 1976ish from memory.
Tony.