I have to slap my head on this as I used to do these sort of cleaning tasks back in the day with the Famicom and the Megadrive.  The old DS I have started having issues with the R button.  It was responding at random and so I thought the button was just busted.  In fairness, the system is really old, and literally glued together due to numerous abuses from other people.  I decided to do a quick