(CSL81) Mis-Adventures in Self Bondage 22

Description: There is a new and interesting looking wall-mounted wooden post in the studio with some cool cuffs attached. anyone with an inquisitive mind would have to try it out, wouldn't they? the key to the locks is hanging on a hook on the side of the post, seems safe enough.. but what if the wooden post had an unusual one-way rope tightening mechanism you hadn't noticed or quite realised how that worked?  you may be there a while..