A handle assembly, including at least: a first handle including at least one recess and a square spindle configured to be received at least partially within the recess of the first handle, in an initial configuration, the first handle is configured to slide freely along the longitudinal axis of the square spindle over a given distance, the first handle is configured to pass from the initial position to a securing configuration in which the first handle is immobilized in translation and in at least one direction of rotation with respect to the square spindle, by at least one displacement in rotation of the first handle about the longitudinal axis of the square spindle through an angle strictly less than 360°.