This shows well the East cable channel allowing the imaging scope dewstrap cable, the camera USB cable and the camera serial cable (both required when using a Canon DSLR) to exit from within the hollow mount. The cables entered the mount just above the polarscope on the RA housing (seen later).
A side view of the ADM
dual dovetail plate can be seen here as well. This plate allows attachment of either the Losmandy or the Vixen style dovetails.