This probably will not help, but, I have always been told that if I intend to smash down the barbs on my hooks, to never come in from the side of the hook with the flat nose pliers to smash the barb down because it may break the hook at the barb. I was always told to come in from the hook point with the pliers and smash down the barb.
Just what I have been told.
Warren
Fly fishing and fly tying are two things that I do, and when I am doing them, they are the only 2 things I think about. They clear my mind.