LBS says "a drop of oil." So, good, I'm leaving it the way it is
The seal over the bushings should be enough to keep out all but the finest grit. (It was before, and I was careful not to damage it and to put it back together properly.) And if I understand it correctly, the ceramic should be harder than most grit.
BTW, WD-40 is not engine oil! It's a mixture of kerosene and solvents. I agree about not using it for lubrication though!




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