i can change an SD mk 1 switch in the dark hehehe
parts: 1, part probe or good twezers, 2, thin pliers or needle nose pliers,
3, radio shack part # Mini SPST 1.5-Amp Momentary Pushbutton Switch (2-Pack)
Model: 275-1556 | Catalog #: 275-1556
you have to have had before hand, bent and solidered one leg to switch body, then insulate other leg and bend over grounded leg.
take switch button top off,( well if its broken off, ok )take SD apart, remove battery, look down or feel with probe or twezers for a little dimple next to bottom of switch body, and turn to left, kinda hard to do but its a push down with tool and push to left with tool, as in lossens push down lghter and push left more like using tool to turn a screw, when switch lossens enough, turn over and it will fall out. used leatherman to take switch from inner holder, and in the dark put two lock washers on the in side ( gf was asleep, i was in bed. hehehe) it gives a seemingly shorter switch
throw.
i use those switches for the PTs i am making too.