Disassembly
[*]Remove the four (cross-head) screws securing the motor mechanism to the housing.
[*]Use long-nosed pliers to ease the cover off the housing, moving from clip to clip. There are five clips.
[*]Unclip the small plastic access cover on the bottom of the mirror housing.
[*]Pull the electrical cable through the bracket, by reaching into the access hole, bringing the piece of foam with it. The mirror housing is no longer attached to the bracket.
[*]Pull the electrical cable through the metal tube, bring the foam with it. The metal tube and spring are now loose.
[*]Try fitting the tube, without the spring, into the bracket, to see how it should lock in place (and to check that the parts are not damaged).