The swivel rig is made by attaching a small barrel swivel that matches the outside diameter of your circle hooks to a piece of rigging wire, passing the wire down through the bait’s upper lip and nesting the top end of the swivel on the top of the bait. The wire is then brought around the backside of both gills, through the eye sockets and wrapped down around the protruding swivel. Once you have a bunch of these rigged up, you simply make a bunch of leaders with the circle hook snelled on the end. When it’s time to rig up, you just pass the circle hook through the swivel and start trolling. The problem is that sometimes it’s hard to get swivels to match your hooks, and you sometimes have to modify the swivel with a pinch to make the hook stay in place. The one-size swivel also means you are stuck using the hooks that fit it. It can also be a chore for a newbie to get the hook through (or out) of the swivel when changing baits.