Remove the pluggable screw terminal / wire assembly from the board and set them aside for the next step. Install the PCB into the recess on the under side of the Aluminum block as shown, with 4x M3x6mm Screws

On the provided connector you removed in step 1, is a blue wire with a M3 ring terminal already installed on it. Install the included Magnet with an M3x6mm Screw as shown onto the ring terminal. This magnet is the clip you will attach to the endmill when probing