Chuck requested pics of the underside of the vibratory deburrer to show the counterweight. The underside actually doesn’t show very much, just the motor bolted flat to the lower plate:
The real story is here, between the two plates:
The counterweight started as just a hunk of aluminum, but in my quest to get more vibe out of the system, I bolted a hunk of stainless onto it as well. I’m thinking of switching to a belt driven counterweight of some sort so that I can have less wear and tear on the motor bearings and also vary the speed and amplitude of the vibration more easily.