This is the stabilizer washer [WACCA] that can suppress the roll of the rod bearing. By suppressing the roll angle of the ball bearing, which is the most movable part in lever operation, smooth operability can be obtained, and the generation of abnormal noise can be suppressed. [Brand] SMK Craftworks [Model Number] SMK-WACCA050 [Quantity] 8 pieces [Washer Size] Outer diameter approx. 6mm, inner diameter approx. 3.7mm * There are two thicknesses. Please use either one because the distance from the bearing cover to the lever differs depending on the bearing manufacturer. SMK-WACCA025 (thickness 0.25mm): Alexander, etc. SMK-WACCA050 (thickness 0.5mm): Colorful rods made by SMKCraftworks, etc. * Please be careful not to pinch the washer itself between the bearing and the screw pedestal during installation. * It does not guarantee the effect on all instruments. Efforts of each company are put into it, such as those that originally suppress the roll with a spring or with a washer. * Please be careful not to lose the small parts. Free shipping nationwide * Shipped by regular mail