Attach the main horn piece to the main horn bend with M2.5 screws and nuts.

Run the QT Py and the arcade button wires through the arcade button mount and the main horn bend.

Mount the arcade button mount to the main horn bend with M2.5 screws and nuts. Insert the arcade button into the mounting hole.

Plug a STEMMA QT cable into the QT Py's STEMMA port. Then, insert the QT Py vertically into the horn electronics piece. Line up the QT Py's USB port and STEMMA cable with the holes.

Mount the horn electronics piece to the main horn loop with M2.5 screws and nuts.

Attach the slide bend to the inner slide piece with M2.5 screws and nuts.

Attach the potentiometer slide to the slide bend with M2.5 screws and nuts. The potentiometer slide should have its potentiometer mounting hole facing the inside of the assembly.

Plug the other end of the STEMMA QT cable into the NeoSlider's bottom STEMMA port. The front logo should be oriented right-side up in the top left-hand corner with the STEMMA QT cable coming out the opposite side of the board.

Insert the NeoSlider's knob into the mounting hole on the slide loop. Mount the NeoSlider to the mounting holes on the horn electronics piece. The holes are undersized, so M2.5 screws should attach without needing any nuts.

That completes the assembly!