Bob, I bought eight bits about ten years ago when Auralens still sold them. I am currently using the third from the last bit. They can still be used until there is no grit left on the metal bit.
Also, I believe someone from Australia was recommending just using your mandrel with some cerium oxide and running it up and down inside the bead to remove the release. In a pinch, if you can't find/don't want to buy the bits, this will work.
ESC
Oh, and my vote goes for Dip n Go Sludge and then Blue Sludge for BHB.
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