When I wrote Truss Rods Made Easy, I mentioned that Ovation, bowl-back guitars, without a regular sound hole, had to have their truss rods adjusted through an access port around the back. I didn't have a guitar handy for a photo, though, and pretty much forgot about it until a couple of weeks ago when I was working on one.
I took a quick video.
And, since I'm essentially an excitable child, I felt the journey inside was just crying out for a horror-movie drone over it.
No, you're a nerd!