Abstract: The mechanism for adjusting an axis of a mirror or other optical element comprises three major parts; i.e., a rotational mount, a mirror normal mount and a mirror plane mount. Relative motion of the rotational and normal mounts about a mutual cylindrical axis provides adjustment of the scanner axis in a plane containing the scanner axis and in a direction normal to the mirror. In a similar fashion, relative motion of the normal and plane mounts about a second mutual cylindrical axis provides adjustment of the scanner axis in a plane containing the scanner axis and in a direction parallel to the mirror surface. Careful control of the relative motions mentioned above allows for the independent adjustment of the scanner axis in the mirror plane and mirror normal plane about the center of the scanner mirror.