I have 2 "regular" flakers, yet to make an ishi, and one has a very fine point and all I do is lay the point flat and pop off tiny flakes in a pattern that will make tiny serrations. Only remove flakes on one side of the head, no flipping it. Gets em so sharp I'm trying to get a good head made to sharpen and test against one of Gill's. No a reading before sharpening flaking either. Read this method in a couple older books that were probably just rewriting what the first guy said but it works well enough to cut leather cleanly in 1 swipe like Gills video.