Special clutch nut washer DERBI for DERBI Euro 1, 2, 3 & 4

Here is the clutch nut washer for DERBI Euro 1, 2, 3 and 4. This washer simply allows the nut of the nut not to loosen. Indeed when the nut is tight, it must be twisted to avoid this. But by force the washer wears out and therefore in case of doubt rather than breaking everything, do not hesitate to change it.