Hudy conical clutch washer springs
New from Hudy, these conical clutch washer springs offer more consistent clutch operation for maximum punch. When using the standard spring, after the clutch is set for the first time the spring becomes deformed over time and needs re-tightening. This new conical clutch washer spring set allows the clutch to retain its setting for a very long time without needing readjustment. Suitable for 1/8th and 1/10th clutches they are sold in a set of 0.4mm washers (8pcs) and 0.6mm washers (8pcs).
Source: Hudy [hudy.net]