The latest in the series of videos I've been doing on the many uses of scythe stones. Deburring the backside of conventional serrations is usually the most challenging aspect of sharpening the typical hollow saber grinds found on serrated knives. If you sharpen both sides using the edge of the stone, you thicken your angle. If you use a flat surface, you only deburr the points of the serrations and accelerate wearing them out. The curved sides of a scythe stone allow you to maintain very nearly the same angle as from the factory.