New conical clutch washer springs offer more consistent clutch operation for maximum punch. Set of 0.4mm washers (8pcs) and 0.6mm washers (8pcs). When using the standard spring, after the clutch is set for the first time the spring becomes deformed over time and needs retightening. This new conical clutch washer spring set allows the clutch to retain its setting for a very long time without needing readjustment. (click to enlarge) (click to enlarge) (click to enlarge)