Help identifying a black round piece with three rings I'm on a personal project to document the brick list for building every one of Chris Deck's Star Wars miniatures (http://sw.deckdesigns.de/minis.htm), and I'm unable to find in the Lego catalogue or Bricklink a canister-like black piece with three different radius values. Look for the second step (3rd picture) in http://www.brickshelf.com/cgi-bin/gallery.cgi?f=93630.

Thanks!
I believe that the part you are looking for is 6221 (Peeron 424) :



This part was most commonly found in Technic sets and was often used as a spacer on longer pins or as a crank handle:



Here it is on Bricklink.