Please: Chunking for big tuna is not yet part of my life experience. I see the picture in Jeff's book with the hook hidden and a swivel showing. I am laboring under the notion that a big circle hook needs to be exposed to be effective, yet get the notion from somewhere that hiding the hook can be important. What hook do people use for chunking? Swivel, ring, nothing? Hide it in the bait or leave point and eye exposed? How big a chunk - match the chum line, or depends on the hook? Photos?