Abstract: An apparatus for positioning a retroreflector. The apparatus includes a retroreflector, where the retroreflector further includes an effective aperture. The apparatus also includes a retroreflector mount for holding the retroreflector, where the retroreflector mount further includes a front end and a back end obverse to the front end, where the effective aperture is exposed through an opening in the front end. The apparatus further includes a plurality of parallel radial flexures including a first radial flexure and a second radial flexure parallel to the first radial flexure, where the first radial flexure surrounds the front end, and where the second radial flexure surrounds the back end. Additionally, the apparatus includes an actuator for positioning the retroreflector, where the plurality of parallel radial flexures allow for one-axis movement of the retroreflector of ±2.5 millimeters perpendicular to the plurality of parallel radial flexures, with an axial deviation of less than 0.001 radians.