Michael Koblic wrote:
Has anyone ever made their own vibratory tumbler? Does anyone use one to
tumble small steel parts?

I've seen a plastic bucket siliconed to the cone of a larger woofer,
face up, and hooked to the shop 100-watt stereo. filled with walnut
hulls or similar, sometimes with liquid for a sort of (non-ultra)sonic
cleaner
Efficiency dependent on choice of music.