An imaging transducer assembly is combined with a sensor of a medical positioning system, forming a transducersensor assembly. The primary container comprises a primary outer shell that encloses a primary reservoir pot, having an expanded upper portion and a tubular lower portion, a primary wick and a primary grow pot. The wedge angle of each wedge member is set sufficiently small and, by utilizing varying torques acting on the cam shaft, said members are each moved and locked in one axial direction with a spring.