I like corncob media for tumbling, I squirt some liquid pre wax cleaner turtle wax or meguires brand on some small cotton old t-shirt material, does not clump the media.
Picture is of the rotary tumbler I made from plans in the American Rifleman magazine in the mid 70's. Was made from plywood, two junked clothes dryer pulleys and a scrapped furnace blower motor, cleans brass in a hurry.
