This is all good as I need to make a couple of tumblers for work to tumble the wedgepins we have as some are a little rusty on the outside straight from the machinists and some have a little surface rust from storage. I'll be checking out the videos and looking at what can be done. At the moment we use a small weed spray bottle adapted for the C4 lathe!! Would be interesting to see what's the best media for tumbling, what do people use for media for steel?