http://www.nutrac.info/2013/06/09/my-new-hand-sickle/Here it talks of sharpening a hand sickle with a Dremel tool. Huh? Maybe a nice round rock would work.Grass hooks or hand scythe I found to be tricky, got it sharpened but the freaking curve of the blade, and the edge on the inside of the curve. Tricky. what is this round stone you speak of my friend?