An installation includes at least a pressurized lubricating circuit for elements housed in the rocking crankcase, each circuit including a radial transfer bearing between two opposite cylindrical journals coaxial about the rocking axis, one fixed journal on a fixed part and one pivoting journal on a pivoting part integral with the pivoting crankcase. The circuit board receives a pressure signal via the plate and the touch pad, and drives the lighting device to provide light. The screw shaft includes a main body portion and two rotary shaft portions provided on opposite ends of the main body portion integrally with the main body portion.