I now know the overall size of thew master cam for a top mounted speed graphic. these dimensions include the "feet" which fits in slot of tube. But what if any is the shape? There is a figure 7 in the maintenance manual is this to scale and correct for the master cam? The high point of the master cam is the same as that of my 127mm cam can this not be used to set the infinity point?

As long as you keep the cam on the proper height of the cam it can be used for infinity adjustment.

Thanks for that.Id come to this conclusion but having someone confirm it is a great help. May well rewrite the manuals instructions to help others because its far from clear! Unless you know of course!Thanks.