Is this (factory item) a consumable? I can't see why you need the aftermarket nut and extra tabbed washer other than a CYA exercise against dodgy mechanics and a way to exclude people who don't have the castellated socket.

What about the speedo gear (the service guide says to fit a new one)?

Pondering a full re-bearing of an MA and don't want to get stuck on a point of detail.

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