Dad made a single cylinder wet tumbler from a threadmill, very few notes left with it. A 6" PVC 22" long pipe with a cap at one and a screw on cap the the other., Fill cylinder with with brass, 5 lbs of pins, 2 Tsp Dawn, 1 tsp dishwasher dryer, fill with water. Didn't matter if I used Teflon tape or wet seal it leaked. Brass would have wet seal on them and some of the pins would be stuck in it. I replaced it with a rubber expansion plug. Max time for the threadmill is 150 minutes. Brass comes out looking great. Wash water goes into the flowerbeds, boxwoods and roses seem to like it along with rinse water. Rinse 2 times and spin to remove pins then back into the cylinder with 2 Tsp Nu Finish and filled with water. Set timer for 150 minutes. Spin and rinse 2 times to remove more pins. Garden plants don't need this water, dump in lawn. Then to a 10" pvc cylinder with screened windows with a fan behind the threadmill for cool air drying for 150 minutes. Added note, wash hands, apply a little Nu Finish to hands before handling brass. I had orange spots when I didn't. Inspect 380, 9m, 38spl, 357 and 223 brass before loading. Pins like ti hang in them.