I've just made this tutorial: One Diabolo Behind the Back Suns.
I made it because I've seen a lot of people struggle to master this trick easily. The movements can be confusing when trying to learn.
The tutorial doesn't include much instruction - it relies on video from the front, back and side as the trick is extremely simple but has awkward arm movements. I realised that providing instruction wouldn't add much for someone wanting to learn - the video angles should hopefully be enough.