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I have been using the same ball bit or similar, that I bought a bunch of at an estate sale, Dental bits. They are 1/8 in shaft that fit in a Dremel Flex Shaft.

I use them at the slowest speed to...

Yea, that is the bad thing about the HF Ultrasonic, that the tray is not removable. According to the reviews, that is where they fail, by dumping the liquid, it gets into the electronics.

So,...