Have a gander on utube and see some of the tumblers that folks have made. I made my own from a plastic bucket, a windscreen washer motor and some rollers attached to a ply base and frame. Cost about 30 quid and works an absolute treat. I use some citric acid crystals, a dishwasher tablet and a squirt of Fairy liquid along with the brass and SS pins. Run it for an hour and the brass looks brand new inside and out.What wet tumblers are people using, any links would be much appreciated.