The #31 mount set adapts specific#2 and #3 shutter housing types to attach in between NIKON HMX type lamp-houses and a spinning-disk “CONFOCAL” optic device. This mount can be attached to all shutter types (LS, VS or the CS25 Series). A clearance cutoff (1.38”/35mm from the aperture center) is provided with the VS series only (see figure 10).