This tray allows you to use US and Japanese cartridges on any 64 console This is a very easy mod that should take less than 10 minutes Tools Required (not included) 1 Gamebit Driver 1 Philips Screwdriver Instructions Remove the Expansion Pak Remove the 6 Gamebit screws from the bottom of the console Remove the 2 Philips screws from the old cartridge holder Install the new cartridge holder and reassemble