Run the four breakout wires through the cassette player's battery door. Reattach the back of the player with the four screws.

Attach the perma-proto board circuit to the 3D printed plate with M2.5 screws and standoffs.

Slide the plate's notch over the cassette player's belt clip.

Attach the motor's wires to the motor terminal block. Attach the player's power wires to the power terminal block. Make sure that the positive wire is attached to the positive terminal and that the negative wire is attached to the negative terminal.