The right arrow key on my //e finally became unusable. It appears this is a long stem ALPS switch. Taking it apart and digging online I find the way it works is when the plunger goes down, the pressure is redirected horizontally by a "leaf spring" which presses against a switch plate. There is a tiny dimple in the center of the leaf spring which I suppose enhances the pressure. Experimenting with an ohm-meter shows that the switch plate works fine if I remove the leaf spring and apply the pressure directly with a small screwdriver. So I wondered if it might be worth trying to reshape the leaf spring with tweezers to get the pressure up. Perhaps another option is to try and clean the contacts in the switch plate (how?). On the other hand maybe all this is unlikely to work and it would be better to search for a replacement (not sure of the prospects?).