Hi Joel,  I would highly recommend using the Tumble-Vibe 5 vibratory
tumbler made by Raytech Industries.  Last fall I purchased the TV-5
Metal Finishing Kit.  I got the 115V TV-5 Metal Finishing Kit #23-091,
which includes the Tumble-Vibe 5 vibratory tumbler, 2 lbs. of 1/4" Green
Pyramids, 2 lbs. of 1/4" White Pyramids, and 1 lb. of Dri-Shine III.

  http://www.raytech-ind.com/finish2.htm

I know this may seem like an advertisement, but I love my Tumble-Vibe
5!  It puts a very nice, smooth shiny surface finish even on extremely
rusty screws and odd shaped hardware.

David Vanderhoofven