Assembly comprising - a housing comprising a wall; - a flap that is movable with respect to the housing; - an actuator for the locking/unlocking of the flap, with this actuator comprising: • a box comprising a protruding finger defining an axis R of rotation; • a head that is movable with respect to the box and located in the housing; - a device for attaching the actuator to the housing, with this device comprising: • at least two projections (23, 24) coplanar and angularly offset, with these projections (23, 24) protruding radially from the finger; • a cut-out that has an exterior profile equivalent to the exterior profile of a cross-section of the finger at the location of the projections (23, 24); • a shoulder protruding radially from the finger; the actuator pivoting about the axis R of rotation between an aligned position that allows for the passing of the projections (23, 24) through the cut-out and a non-aligned position that prevents the passage of the projections (23, 24) through the cut-out; characterised in that - the cut-out is made in a partition wall of the housing facing the wall, this cut-out allowing for the introduction of the projections (23, 24) between the wall and the partition wall in the aligned position and the maintaining of the actuator in the non-aligned position; - the thickness of the partition wall is substantially equal to the axial dimension defined between the shoulder and the projections (23, 24); - the finger is in a hole made in the wall. - a housing comprising a wall; - a flap that is movable with respect to the housing; - an actuator for the locking/unlocking of the flap, with this actuator comprising: • a box comprising a protruding finger defining an axis R of rotation; • a head that is movable with respect to the box and located in the housing; • a box comprising a protruding finger defining an axis R of rotation; • a head that is movable with respect to the box and located in the housing; - a device for attaching the actuator to the housing, with this device comprising: • at least two projections (23, 24) coplanar and angularly offset, with these projections (23, 24) protruding radially from the finger; • a cut-out that has an exterior profile equivalent to the exterior profile of a cross-section of the finger at the location of the projections (23, 24); • a shoulder protruding radially from the finger; the actuator pivoting about the axis R of rotation between an aligned position that allows for the passing of the projections (23, 24) through the cut-out and a non-aligned position that prevents the passage of the projections (23, 24) through the cut-out; characterised in that • at least two projections (23, 24) coplanar and angularly offset, with these projections (23, 24) protruding radially from the finger; • a cut-out that has an exterior profile equivalent to the exterior profile of a cross-section of the finger at the location of the projections (23, 24); • a shoulder protruding radially from the finger; the actuator pivoting about the axis R of rotation between an aligned position that allows for the passing of the projections (23, 24) through the cut-out and a non-aligned position that prevents the passage of the projections (23, 24) through the cut-out; characterised in that - the cut-out is made in a partition wall of the housing facing the wall, this cut-out allowing for the introduction of the projections (23, 24) between the wall and the partition wall in the aligned position and the maintaining of the actuator in the non-aligned position; - the thickness of the partition wall is substantially equal to the axial dimension defined between the shoulder and the projections (23, 24); - the finger is in a hole made in the wall.