This M16-Base Station..:-O - no is an Extruder thing :-)) You need a strong spring and carefully put into the extruder back side. Left or right position depends where is the filament wheel left or right of the motor pulley. With a drilling machine you open up the holes to 4mm. After installation you do not fix the screws too hard, slightly you can move the extruder assy under ther screws. The spring do hold the extruder firmly on to the motorpulley.