The mechanism includes a first part and a second part movable relative to the first part, a spring member acting on the second part such that the second part is biased onto a contoured surface, and a damper element for absorbing impacts to the first part associated with one of the first part and the second part such that movement of the second part relative to the first part causes movement of the damper element relative to one of the first part and the second part without contacting the other of the first part and the second part.