Blackburn Trackstand RX-1

I was thinking about getting a trainer, but was having trouble justifying the money on one right now.  Well, I stumbled across an old Blackburn Trackstand RX-1 that was being tossed out.  It looks super simple - just an frame and a roller with no obvious way to adjust resistance.  Searching the web, the only thing I can find is that I might need a special skewer for it to work.

Does anyone have any suggestions on how to use this thing?  Manuals? Anything? 

TIA