A part of a gamecube controller, specifically the part that plugs into the gamecube. Many of my controllers were not in working condition after many years of use and the culprit is most always the cord. If the cord was frayed at the controller end, that can be an easy fix, just cutting off the bad, frayed wire and resoldering. The other end is a pain. I had to make this part because I had broken two of these pieces in an attempt to fix the breakage. It works quite well for guess work. Very little exists in the way of a tutorial on fixing these so if there is a demand for such a thing, I may very well put something together. As far as wiring I just followed this site's diagram.

http://www.int03.co.uk/crema/hardware/gamecube/gc-control.htm