![Image](https://i.imgur.com/htbsM4A.jpg)
So I decided to experiment and bought one of these:
![Image](https://i.imgur.com/JLs1zJx.png)
Turns out each drum holds about 200x 9mm cases, so I added hot water, a dash of Dawn dish-detergent and a pinch of Lemi-Shine into each drum (no pins). I ran the gadget for an hour to get a baseline, et voila:
![Image](https://i.imgur.com/jMT0F2h.jpg)