Desoldering components without damage
I've used the ChipQuik alloy that Wesley is talking about and its good. Another low-tech method is to apply a fine soldering iron tip at the switch pins and once the solder melts lift the pin ever so slightly and slip in a piece of paper between the pad the board. This ensures that the pad does not reattach when you are doing the other pads. You'd think the paper would burn but it does not, atleast not to the point where the pin burns through the paper and reattaches to the pad.