Well, this stinks! It doesn't matter that I can fit 9 stops on the big Lazy Susan bearing if the physical aperture at the back of the lens is large (66 mm in an 80.2 mm plate on 12" Metrogon). The 9 stops overlap the lens so more than one is illuminated...dim idea...

I might only be able to fit 3-4 stops in a circle spaced far enough apart to not be exposed more than 1 at a time. A linear array of Waterhouse-style stops would be as long as a monorail! Hmmmm.