Disassembly and Assembly: Disassembly

Place the mirror body with the mirror glass facing upward.
Put a strip of protective tape on the mirror body.
As shown in the figure, insert a small slotted screwdriver into the recess between the mirror face (mirror holder) and mirror holder bracket, and push up the pawls (2) to remove the mirror holder lower half.

Fig 1: Disassembling Door Mirror
Courtesy of NISSAN MOTOR CO., U.S.A.

NOTE: When pushing up the pawls, do not attempt to use 1 recess only, be sure to push up with both recesses.

Insert screwdriver into recesses, and push up while rotating (twist) to make work easier.
Lightly lift up lower side of mirror surface from mirror surface, and detach pawls (2) of upper side as if pulling it out. Remove mirror surface from mirror body.
NOTE: Be certain not to allow grease on sealing agent in center of mirror body assembly (actuator) or back side of mirror surface (mirror holder).