Solder socket headers to the PiCowbell. You can use the Pico W as a jig to keep the headers secure.

Attach four M2 standoffs to the Pico W's four mounting holes with M2 nuts.

Attach the Pico W to the case lid with four M2 screws.

Attach the OLED screen with four M2.5 screws and nuts.

Plug the PiCowbell into the Pico W. The STEMMA port on the PiCowbell should be below the USB port on the Pico W.

Connect the OLED to the STEMMA port on the PiCowbell with a STEMMA QT cable.

Solder two 2-pin sections of 90 degree header:

• Pin 14 and the GND pin next to it
• Pin 10 and the GND pin next to it

Point the long side of the header outwards.

Take two of the quick-connect wire harnesses. Press the ends gently but firmly onto the arcade button. Then pass the wire harnesses through the hole in the case, through the threaded nut, and attach them to the right angle headers.

Plug the button in on Pin 14 and the LED on Pin 10. Check the polarity of the LED, so that side marked "-" on the Arcade Button is connected to GND.

At this point, you can load the code and make sure that the button and LED work. If the LED is not working, try reversing the connection by simply plugging the connector in the other way. If nothing's working, try swapping the two connectors.

Now, secure the arcade button in place with the nut, then carefully curl the wires around the interior of the box until you can snap the lid into place.