Kinematic mirror mounts Kinematic mirror mounts rely on a pivot point at one corner and two orthogonally oriented adjustable actuators to provide near-independent rotation of a mirror about the vertical and horizontal axes. In a typical design, the mirror is mounted on a square mounting plate that is connected to a base-plate behind it by means of a ball-bearing, two screws and two extension springs, see Fig. . The ball-bearing and the screws are arranged in an L-shaped geometry, with the ball-bearing sitting at the corner position. The screws project through threaded holes in the base-plate and the screw-tips push against the mounting plate. Nearby extension springs pull the mounting plate towards the base-plate, and help maintain contact between the screw-tips and the mounting plate as the screws are adjusted. The ball-bearing, which is held between depressions in the two plates, provides a pivot point about which the mounting plate can freely rotate. By adjusting the two-screws, the mounting-plate (and hence the mirror) may be independently rotated about the horizontal and vertical axes.