Fitting an Arca 6x9 Binocular Viewer onto a Classic F (6x9) Camera?

[neil poulsen]

How does one attach an Arca 6x9 Binocular Viewer onto a 6x9 Classic F? I believe it's different than that for the 4x5 Classic F., which fits around the outside of the ground glass. For example, is there an adapter that's required? If one only has the ground glass (the g.g. that doesn't accept sheet film holders), how can one attach the viewer?

[aporodagon]

The 6x9 viewer slides over the ground glass frame (there is a lip around the frame). If this isn't clear I can post a photo.