I've also got a little pensized diamond stick that is awful handy, but easily misused, as I discovered when my daughter tried to use it to sharpen a fishing knife.
What?! Oh, pen sized. I read that wrong. Unlike the oft-misused "LOL", that truly had me laughing aloud "LA" !!! I think there'd have been less double-takes if Benjamin had written it correctly as "pen-sized"
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I too am a wet/dry sandpaper guy, and I like them just as sharp as I can get them....however sharp or dull that is.....