Picked up a trailer mounted post hole digger. It has a Briggs motor that couples to the auger through a "wet" centrifugal clutch and a gear box. Nice design that allows for leveling and safe operation. I can't find any online info about it. I want to know what oil to put in the gear case that will allow the clutch to work properly. The machine is similar to this online image: Dig-R-Mobile post hole digger