This is the most crucial part of the whole procedure. Screw the casing off the flash drive and connect it to the female part of the USB lead. Next you need to place it carefully into the NES casing, and making sure that all of the unnecessary plastic poles and features are gone so you can easily fit in the flash drive. Some modification (i.e cutting) is required to the NES so it can fit well. After that curve the extension lead around the separators and place through the lead hole at the top right of the NES case.