Grain/beading tools call em what you will..they go blunt fast & you want to extend their lifespan..
Get yourself some brass rod that fits your drill chuck & set an "8-cut" diamond upside down. (must be this cut of stone).
Slow speed & voila, a nicely re-sharpened & polished grain tool !
It works great, however the size will no doubt be abit different so bear that in mind.
Thanks to whoever thought this trick up.
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