Like others have said, I use a 50/50 mix of walnut and corn cob in a drum type tumbler. I use a cap full of Flitz additive/enhancer or car polish and tumble for two to four hours to get bright, shiny brass. I also add a dryer sheet (like Bounce) that I cut into strips. The sheets hold down the dust generated by the media.

I hope that helps,

Frank

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