It means Kelford came through!!!
They are clearly aware of the problems that P10DET mentioned, (also showing that hes right

) and that they have worked out how much you can grind off the base circle with out causing problems.
And when they created the profile they made sure the amount that needs to be ground off is below the problem causing amount, as only a small change in the base circle is needed to achieve noticable gains, (also showing that im right

)
What a great debate, leading to us all learning something. Im rather impressed, and P10DET thanks for getting me into it.
(I did notice at the end they mention the skidtype Rocker, did they say anything about the roller rocker? (which they use on the race car,))