Abstract: An equipoising arm structure that can selectively exert force in any direction—lifting, pressing down, or applying lateral bias—with consistent force throughout its range of articulation, comprises a force exerting device having a force exerting structure including a load arm as a first side pivotable about a load pivot, a resilient member attached to the load arm and to a termination point and forming a second side of the force exerting structure. The third side of the structure is formed by a line from the termination point to the load pivot. A first adjustment mechanism moves the termination point to change the length and disposition of the third side of the structure to positions above or below the load pivot. Additional adjustment mechanisms may alter the mounting angle of the entire force exerting structure, and/or the angular relationship between a plurality its force-exerting component devices.