The M-SR-ADP mounting adaptor allows rod-mounting of components, like mirror mounts, at non-standard heights. It is required for mount any of the SN100 or SS100 Suprema^® mirror mounts. With both a counterbored thru hole and threaded mounting holes this adaptor mounts threaded or thru-hole mounts. The scribed line around the diameter of the adaptors to set height when being used with the Q-XE-RA-1 to center optical axis height of a mirror mount being used within the Q-OC-1 Cube.