"First let me explain what this guide explains you to do; Erant's DVDtool uses the top-secret-serial-port on the Wii's drive. To allow for easy removal of the cable used by Erant's DVDtool or any other application that uses those solder points (many, if not all, of the currently available mod-chips for the Wii are drive-mods), I have attached a plug to those points and made that plug available at the outside of the Wii. That way the Wii can stay closed and the cable does not have to be soldered to the drive-board directly. Consequently one can also easily remove and reinsert the cable (or other hardware) while keeping the Wii closed."
Linky: http://wii.scorpei.com/Guides.html
Linky: http://wii.scorpei.com/Guides.html