@wlutke I get what you are saying:
If I am being thick, forgive me - I appreciate your help. Peter
As the stylus traces the flatter arc, the stylus tracing angle changes less in relation to the grooves. The Mint inner and outer null alignment lines will be more near parallel to each other to compensate. Overhang may be different in order to compensate as well.But shouldn't the alignment lines be parallel to the grooves if they occur at null points? This makes the cantilever parallel to the grooves. I think what changes is the angle between the alignment lines and the stylus arc on the MINT. These are not perpendicular, and differ at each null point.
If I am being thick, forgive me - I appreciate your help. Peter