A wiper driven by a motor-driven drive shaft which has a variably-oriented axis and a guiding section of the drive shaft is held between two surfaces of a slide. One of the slide surfaces is carried by a friction plate whose external surface cooperates with a deformable member interposed between the friction plate and a stationary wall of the slide to permit a displacement of the friction plate along a transverse direction perpendicular to the plane of the plate. The formable member acts on the plate, when the guiding section is held in the slide, such that the guiding section rests simultaneously against the two surfaces of the slide.
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