Whats cooking -  Or what to do with an old pot and orbital sander.  Saw the fancy parts tumbler in the Eastwood Catalog 
www.eastwood.com  tumblers 
http://www.eastwood.com/shopping/sea...eyword=tumbler but I had a old air orbital sitting around so.  The first version had just a flat cake pan screwed to the bottom but the abrasive went all over.  So an old pot with cover, fill with worn-out black beauty blasting media drop in small parts and let vibrate at low pressure until clean.