P1020391

This is a better look at the door switch (disassembled). As you can see it has a plastic part which is what the door pushes against, a spring which pushes the switch against the door, and a sleeve that pushes through a hole and supports the switch (it is also what the wire earths against). When assembled the wire goes over the plastic knob which then pushes into the sleeve and at the other end of the sleeve the wire slides over the end of the plastic knob holding it all together.