I was wondering what holds them in? I've seen some people open up there ds and the buttons and pads stay in place in the shell. I ordered some replacement pads because my buttons on my DS Lite are pretty far gone and hardly respond. This is my first time messing with something like this and just wanted to get all the answers and would like to know if I need anything special for them. Also I don't have them yet so this is more of a preemptive question.