After completing my GUE Fundamentals course in February, my wife and I took the plunge and purchased a back plate and wing setup. We're very happy with it. (I wanted to go back plate and wing straight out of Open Water, but one must take baby steps for everyone's comforts.)
Anyway, what I've noticed is that I really need to crank down on the wing nuts that hold our single-tank adapter to the back plate. If I don't, they tend to loosen over the course of a dive and the tank starts to wobble.
How do you all secure your wing nuts to prevent this while still maintaining their ability to disengage after a dive for cleaning and drying?