[Walt Fricke]

Vinny

There is enough slop in the "hole" vernier system that you can, with sometimes tedious fiddling, get to just about any number you want. It is not the pin which holds the cam to the gear - it is the friction the clamping force of the nut (or bolt) creates which keeps them together.

Which isn't to say you can't just use the pin and not worry - depends on how close to what you want.