lifter of fig2 and exhibiting offset of the connecting arm 16 the door shown in fig4 can incorporate a window lifter either with or without cable returns to reinforce vehicle door rigidity automobile manufacturers limit access to the inside of the door the openings provided in the door allow equipment and fixtures to be introduced inside the door in fig4 the door 23 has a hollow section 37 and openings 38 40 that allow equipment and fixtures to be introduced into the door 23 the openings 38 40 allow the window lifter 10 to be placed into the hollow section 37 the openings 38 40 are separated by a support portion 39 ensuring rigidity of the door 23 the hollow section 37 delimits a damp and dry region one inside the hollow section and the other outside towards the inside of the vehicle as shown in fig4 the first guide rail 12 and second guide rail 14 are inside the hollow section 37 and the connecting arm 16 is the outside hollow section 37 the window lifter 10 can be arranged in the door by for example first introducing the upper ends 12 a and 14 a of the guide rails 12 14 into the openings 38 40 the ends 12 a and 14 a are then inserted more deeply into hollow section 37 toward the top of the door until the lower ends 12 b 14 b of rails 12 14 can be introduced via openings 38 40 into hollow section 37 the connection between the connecting arm 16 and the rails 12 14 at a point between their ends allows such a maneuver the window lifter 10 is then lowered towards the bottom of the door and then secured.