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As Barney would say, true story: Although I have long been partial to coticules I was using mostly synthetics until five or six years ago when I went heavily into jnats. Boy did I fall down that...

To add to Ecl's comment..

Here's an old school technique to "prep" a coti, to wit.. I use the side of an old Chinese knife - the kind that looks like a cleaver - and work the stone with heavy...