The line between the arm pivot and stylus is called ''effective length''.
The correct stylus position can be adjusted either by moving arm
pivot forth or back (SME method) or by moving the stylus in
the headshell till the stylus reach the point at which the right distance
to the pivot is adjusted. This distance determine the right geometry
as intended by the arm producer. By using headshells with
''movable'' 4 pins connector one can adjust the mentioned distance
as well the azimuth by turning the headshell around 4 pin connector.
When both adjustments are done the 4 pin connector should be
fastened by the included screw.