The adjustable NANIWA NA902 base is ideal for supporting whetstones during sharpening. The base is easily adjusted with the help of a set of adjustable screws, allowing the placement of stones up to 22 cm. The rubber parts slide smoothly along the guide, offering excellent stability on the surface. After use, it is recommended to dry the metal parts of the base to avoid corrosion. Lubricating the moving parts with maintenance oil ensures smooth operation. With this base, the movement of the whetstones during the sharpening process is minimized.