Does it have any name/model number somewhere? I may be mistaken But I am wondering if it is suppose to have a small thin belt on it. Like the old power belts used on some of the older tractors. They would be used to power accesories like sawmills. They use to use the thin belts in old water driven wheel powered shops. It looks like the big wheel on the left would be able to use one and then to adjust the speed put it on a different area. Look on the owwm.com site,maybe you will see a photo of one setup.