A support assembly for supporting a remotely-controlled instrument driver, including a first member, a second member for supporting the instrument driver, and an interface assembly for allowing the second member to rotate relative to the first member about a first axis, and for allowing the second member to rotate relative to the first member about a second axis that forms an angle relative to the first axis, wherein the interface assembly comprises a ball that is rotatable relative to the first member, and a shaft extending through the ball, the shaft configured for coupling to the second member.
