Those Gonzo Games machines deliver a very satisfying spank, and are definitely a lot more fun than the more common type of spanking machine seen on Youtube. Looks like they were made on a low budget too, from bits of old bicylces. They may not even have been fully mechanised - there could be a person concealed in each large wooden box watchign the speedo through a hole and operating the paddle mechanism by hand. I've got an urge to try and make one now, thanks for posting this | 
