Access Port for Cables
This view shows the top of the RA axis housing and the cable access door through which the three camera cables are entering on the left and the two dewstrap cables are entering on the right. These cables then run through the mount and out the cable channels below the dovetail plate, as seen in the previous frames.
The small remaining opening seen here is now covered with electrical tape to keep the "critters" out.
You also get a good look at the RA motor housing - the one that holds all the 'magic' of the mount.