My driver's window would go down but not up so I pulled the switch unit out and took it apart and cleaned the contacts (were very carbonised) and now all the windows work well.
BUT when I had the switch unit apart the button part (that stops the kids playing with the rear windows) suddenly fell apart and for the life of me I can't figure out how it all goes together again. I can see what to do with the white plastic slide bits and the main coil spring, but there's a small black spring that has about three spirals with last fourth spiral pulled out at right-angles from the others. Does anyone know precisely how it fits back in? And any tricks to handle the fiddliness of it all?