A rotorcraft comprising flight controls (120, 103, 104), at least one rotor (120, 130), and an apparatus for transmitting a mechanical control signal between the flight controls (120, 103, 104) and the at least one rotor (120, 130), the apparatus comprising: a flexible kinematics element (200, 405) that has a longitudinal axis and comprises: a conduit, and a linear control signal conveyor that performs a linear movement relative to the conduit to convey the mechanical control signal; a control signal transmitter (406, 407, 408) that transmits the mechanical control signal; and an interface element that is coupled between the linear control signal conveyor and the control signal transmitter (406, 407, 408) and comprises: a first lever that is connected to the control signal transmitter (406, 407, 408) and rotates around a first axis, a second lever that rotates around a second axis that is different than and parallel to the first axis, and an interconnecting element with a first attachment, a second attachment, and a third attachment, wherein the first attachment is connected to the first lever, the second attachment is connected to the second lever, and the third attachment is connected to the linear control signal conveyor of the flexible kinematics element, characterized in that: the third attachment is equidistant from the first attachment and the second attachment, and the first axis of the first lever and the second axis of the second lever are on opposite sides of the longitudinal axis of the flexible kinematics element (200, 405). a flexible kinematics element (200, 405) that has a longitudinal axis and comprises: a conduit, and a linear control signal conveyor that performs a linear movement relative to the conduit to convey the mechanical control signal; a conduit, and a linear control signal conveyor that performs a linear movement relative to the conduit to convey the mechanical control signal; a control signal transmitter (406, 407, 408) that transmits the mechanical control signal; and an interface element that is coupled between the linear control signal conveyor and the control signal transmitter (406, 407, 408) and comprises: a first lever that is connected to the control signal transmitter (406, 407, 408) and rotates around a first axis, a second lever that rotates around a second axis that is different than and parallel to the first axis, and an interconnecting element with a first attachment, a second attachment, and a third attachment, wherein the first attachment is connected to the first lever, the second attachment is connected to the second lever, and the third attachment is connected to the linear control signal conveyor of the flexible kinematics element, a first lever that is connected to the control signal transmitter (406, 407, 408) and rotates around a first axis, a second lever that rotates around a second axis that is different than and parallel to the first axis, and an interconnecting element with a first attachment, a second attachment, and a third attachment, wherein the first attachment is connected to the first lever, the second attachment is connected to the second lever, and the third attachment is connected to the linear control signal conveyor of the flexible kinematics element, characterized in that: the third attachment is equidistant from the first attachment and the second attachment, and the first axis of the first lever and the second axis of the second lever are on opposite sides of the longitudinal axis of the flexible kinematics element (200, 405).