Abstract: An optical mount which has a locking fastener. The optical mount may include a first plate and a second plate. The first plate may capture an optical device such as a lens or a mirror. A collet may be attached to the second plate. A first drive screw may extend through a threaded bore of the collet and engage the first plate. Rotation of the drive screw in one direction can move the first plate away from the second plate. The mount may further have a spring which pulls the first plate back toward the second plate when the drive screw is rotated in a second opposite direction. The collet may have a slit that separates a collet flange from a collet base. The locking fastener can be actuated to push the collet flange away from the collet base and to lock the first fastener to the collet. Actuation of the locking fastener does not create a corresponding shift between the threads of the fastener and the threads of the collet.