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No mysteries regarding Hirth cranks having throws in phase, its about cutting the splines starting from the same datum. The system gave Ing Carcano & his team the opportunity to alter the phase of the crank pins in the Moto Guzzi 500cc V8.Is the depth of those splines tapered? If so, as a non-machinist, that seems quite a challenge to make the mating component fit with full contact. I suppose CNC machines would go a long ways for that. How the Hirth crankshafts are made to have the throws in phase has always mystified me.