I thought this was a pretty smart setup for the barrel. Its just a short piece of PVC pipe with a cap, reducer and a rubber end cap. Wouldn't be too expensive, easy to build and would be pretty tough. Give's me some ideas....
35lb cap. Rock Tumbler Ball Mill Case Debur Polish - eBay (item 260730808727 end time Feb-10-11 18:51:10 PST)
35lb cap. Rock Tumbler Ball Mill Case Debur Polish - eBay (item 260730808727 end time Feb-10-11 18:51:10 PST)