P09X set is for "progressive" settings of the springs.
P09X set includes 4 pcs of P09X plastic parts and 4 pcs of DIN914 M3X3 set screws.
One of additional holes is for DIN914 M3X3 screw and has 3,1 mm distance to the main RHS screw.
The opposite additional hole is for RHS-P M2 screw and has 3,7 mm distance to the main RHS screw.
Please download full Manual for P09X here: