I decided to have a tentative look at this wet tumbling with stainless pins business, I got hold of a cheapo U.S.A. made rock tumbler, plugged into a step down transformer, sent for a small bag of pins from Spud, tried it using some Carex & Jif lemon juice ... Ki'nnell!!! Bright lights!!!!, stuff came out better than new out the box! ... Just have to be careful with the smaller cal stuff (.17), need to get hold of a pin/rod magnet to ensure none left behind when emptying them.
Just ordered the very thing from here, Buy Magnets Online | first4magnets.com