A relatively simple, relatively small, relatively light-weight, and relatively inexpensive two-axis gimbal mechanism for a human-machine interface is provided. The gimbal assembly includes a first bracket, a second bracket, a center body, a first centering mechanism, and a second centering mechanism. The first bracket and second brackets each includes a first arm, a second arm, and a third arm. The first and second arms form substantially L-shaped sections and the third arms substantially perpendicular from the first arms. The center body is disposed between the L-shaped sections, and is rotatable from a null position about first and second rotational axes. The first and second centering mechanisms are coupled to the third arms of the first and second brackets, respectively, and are configured to supply a first centering force that urges the center body toward a null position when the center body is rotated about the rotational axes.