Use a template with uniform spacing instead of marking repeatedly.
Clamp the template on the dividing panel as a stop.
Perform milling on the surface on both sides with depth setting 10.
Mill the P-System groove on the front side with depth setting 18.
Insert the Tenso P-14 element into the P-10 grooves.
Insert the Tenso P-14 element into the P-18 groove.
Preload the Tenso P-14 to facilitate assembly.
Apply glue.
Connect - finished!