It sounds like all of these, with the exception of the snapped axle, might be what Rad warns about in the manual and one of the many attached warning tags. It says to make sure it is properly tightened, leaving a print on your hand from the lever as mentioned earlier, and to double-check before each use. That sounds annoying, but commercial trucks and aircraft have checklists to go through before each trip. It might seem excessive, but that setup is a bit tricky. The thing I worry about is the axle breaking. That is pretty thin for my liking with all that weight, vibration and speed. I know it's the way it's done nowadays, but it could have been bigger.