A mechanical input element (e.g., a dial or knob) that comprises one or more movable components is attached to an input screen (e.g., a touch screen). A microprocessor detects movement of the one or more movable components of the mechanical input element via the input screen. The detection of the movement of the one or more movable components of the mechanical input element is used to control various types of electronic/mechanical systems, such as controlling a volume on a radio.