Several years ago I was reading an In-Fisherman Catfish Guide and they showed an illustration of an anchored boat with several different types of line sets. One of the road/reel sets showed line coming from the reel to a tree which had some sort of clip that allowed the line to go straight down into the water, from the limb. The clip was strong enough to hold the line with live perch, but when a catfish took the bait, the line would pop free from the clip. Does anyone know what they were using for the clip? Has anyone tried it, if so, does it work well?