Alan thats what I use to, no problem with rust or metal dust.
RazorEdgeKnives, that with tipping the knife down worked well, now the insingo is sharp, i started with 1000 and went down to 0,5. I see that the factory skratces are there, didnt notised them before 🙂
I went from 21 to 20 to 19 degree angle to get it a bit convex