I was think (SCARY) about one of those paint can shakers that Harbor Freight sells. Fill the can with media and rock and roll. May have to line the can with rubber so the blade won't poke a hole in it.
For brass cartridges we use ground corn Cobb's, for a satin finish I would contact the suppliers of this product to industry or a jewelry supply as jewelry makers use them to clean castings and polish rock. Let your fingers do the walking. Gib
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