I have lost 2 flatheads beside the boat this year already because the leader (50 pound Big Game) broke at the snell to the hook. So ... Monday I took 6 pre-tied rigs out of my box and took them to the garage to test. 5 out of the 6 broke exactly the same way - the line snapped right in the eye of the hook (upturned eye kahle) - right where the line comes out of the snell. I tied a couple of fresh rigs up and tested them. Same result. I tied 3 more rigs: one with a clinch knot to the hook, one with a uni knot, and one with a snell to a straight eyed hook (line doesn't even go through the hook eye - just lays along side it). All three knots held. I pulled and pulled on them until I straightened the hooks. I believe that the end of the wire from the hook, where it is bent around to form the eye, is cutting the line. Obviously, I will not be tieing snells on those upturned eye hooks anymore. Problem is, I like the way the hook hangs nice and straight when snelled that way. Plus, I have a few hundred kahle hooks at home with upturned eyes.