I see what bump and scissors straight and 30 degree angle knurlers are, in 1 -2 and 3 wheel setups. I see that many 2 wheelers have opposite cut angle wheels, so in eseence they are 1 wheelers, but with any of the 1-2-3 wheelers, how does that single pattern cut in and repeat itself ? Looking at gear teeth, they have to be calculated and made so that there are no half teeth, which knurling surely would create.