Thrumming is using cord made of any material you like, charged
with a polishing compound, to polish hard to reach areas of
metal. Tie one end of the cord to something stable (I use my
bench leg) and run your piece back and forth along the cord to
You may want to check out the orchid archives to get some great
ideas on materials to use. Go to ganoksin.com on the www and it
will lead you to the archived messages.