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I too feel the 20k is what I can always go to if my edge isnt agreeing with a stone. If I get fed up I grab the 20k and it seems to always do the job right. Im trying to learn the Jnats right now as...

The 20K will give you the slightest amount of more keen. At that level, it's hard to get much more than a 12K but it does give a bit more. I love my 20K. And the fact that I know I'm at the highest...