I tried the ultra sonic cleaner too. Not happy with the results. My Thumbler's Tumbler is the best there is. The stainless pins last forever, and clean the smallest hole/threads there are. As one member said, the flash hole in my brass is better than new. If someone would like try it, I'll send you my vibratory tumbler for shipping cost. First come, first served. I'll keep the HF ultrasonic for my wife's jewelry, but the vibratory tumbler is up for grabs.
