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If I want it sharp I use a stone, oil, strop and all that.
If I want it sharp quicker, but don't care about the quality I use one of those pull through johnys.
If it's super dull, and I don't want to baby it and don't give much of a fuck, I put this bit in my drill and go for it. I got a big cheap cold steel knife and didn't want to bother with the usual methods, this worked pretty well for me.