You usually adjust the blade, or the tholes, rather than the snath - at least on the scythes that I have. Tholes sometimes are made so that you can turn them by hand, re-position, and re-tighten, but the blades almost always have square nuts that you have to remove to set the blade angle, or to change blades. The "snath" is that funny-curved long wooden piece, and the "tholes" are the two short straight handles that jut off of it; "blade" should be adequate for anyone who belongs on this forum!