@Werries - That is a good question and very valid. Initially when experimenting with circle hooks I used to leave the circle hook point exposed halfway down the chunk - it looked ugly and also didn't get as many pulls as the hidden J-hook baits did (my mates still swore by the J-hooks in those days). I started inserting the point into the chunk as with the J-hooks and noticed that when the tuna grabs the chunk the force of the bite and swallowing action totally strips the chunk off the circle and you can hook up as normal by easing the drag up. I haven't noticed any change in hookups compared to J-hooks, except for the fact that you get a far more secure hookup.