The straight lines of Mune and blade are adjusted, and unevenness is shaved with a special plane for shaving metal called Sen (銑, with the radical of 金 and 舌, by right).
棟と刃の直線を修正して、銑（正しくは金偏に舌、せん）と呼ばれる鉄を削るかんなで凹凸を削る。