G3 Universal Grips OTTO G3 Universal Grips were designed for use with OTTO standard pushbuttons, rockers, toggles, and Hall effect switches and the JH and JHM series Hall effect joystick. The G3 Universal Grips can be customized for top-of-the-line machines requiring high switch content, or to provide only basic control functions on lower-tier units. The modular design can be customized for a wide range of machines while providing basic control functions or accommodating a variety of switch types.