The present invention provides a vapor-liquid contact device for use in a distillation column and method incorporating the use of such a vapor-liquid contact device. The system may take advantage of multiple transmitter antenna elements andor multiple receiver antenna elements, or multiple polarizations of a single transmitter antenna element andor single receiver antenna element. A spring has a central helical part winding around a pin connected to the shiftable stripper plate and outer end parts abutting a respective one of two members connected to the frame on opposite sides of the pin. By maximizing cast in features, redundancy between competing parts is eliminated with an increase in dimensional control.