Nintendo seem to use these funny screws on the outside, which are neither cross, star or flat shaped, but like a tripod. I blasted through these with a drill. Took a bit of working to get the plastic shells apart (without damaging them of course!), and then the electricy bits inside. Rather usefully, the small screws inside were all cross shaped, so a mini set of screwdrivers made lightwork of taking this stuff off the plastic shell neatly. It was relatively easy, once i had it open.