I finally broke down and bought an Eastwood Heavy Duty vibratory tumbler for deburring and polishing parts. I had previously tried to make my own tumbler from scratch but failed miserably, vid here:
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This Eastwood machine is awesome, works exactly as advertised, comes with two kinds of media and two bowls. Love it. It takes some practice to know what media and what length of time will give you the finish you're expecting to see. This video describes my practice with the walnut shells with built in polishing rouge. If anything just watch the last few minutes to see the finished result!
