i'm getting a filthy TZ that needs a lot of love. i'll need to get something to polish the screws and other small metal parts. my options are either a rock tumbler or vibrating polisher from harbor freight. which one would be better?
http://www.harborfreight.com/5-lb-metal-vibrator-tumbler-67617.html
or
http://www.harborfreight.com/3-lb-rotary-rock-tumbler-67631.html

i also wanted to check on what type of medium to use and how to use it. HF also has these. figure one of the rust cutting ones would be best, but heard of people using ground walnut and corn cobs:
http://www.harborfreight.com/catalogsearch/result?q=tumbler+medium

thanks for the info. i'll probably get the vibro-tumbler as it looks like it can fit more and since it taking longer than the ultrasonic cleaner isn't a big deal. i just found a 20% off coupon for HF so that makes it a lot easier on the pocket book.

do you know where i could get the walnut medium in a smaller amount than 25lb shown on the HF webpage? or is it likely i'd need 25lb? also, would you recommend course or fine?

do you remember what grit of walnut you used? course? medium? fine? did it get rid of rust and corrosion?