I have seen the beding actually happen with my Camp Nano biners. I didn't wrap the webbing right, and the biner wasn't centered on the tree, but slightly to the side. This made the webbing pull the top of the biner toward the center of the tree trying to center itself, but couldn't because I wrapped the webbing around the tree twice. As I was laying in the hammock I happened to look at the biner, and noticed that it was twisted and bent enough to have opened up. Went back to normal and hasen't hurt the biner from what I can see, but I definately wan't the overkill on the main biner for that reason. I will point out that I use a structural ridgeline, so I put more force than someone who doesn't Like with a Speer or slap strap setup.