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Posted by Andy Carruthers on 08/03/2021 10:42:22: John makes a good point, I recall someone (Hopper?) suggesting to run a file over the finished knurl to take the rough edges off, it has been a while since I made the handles Indeed it was. Was how apprentice toolmakers were taught to do it back in the ancient days of yore. A 10 flat single-cut mill file was the weapon of choice, used on the finished knurl spun in the lathe. Just enough to knock the sharp points and burrs off the knurls. Should be done as a matter of course on all knurling. Straight knurling works very well on things like cross slide dials and is easier again on the hands, after a touch up with the fine file. If you don t file it, a diamond knurl is basically like a rasp and I reckon you could use it to machine wood. ....