Appholler- The clips I use grab the main line and squeeze hard enough that they take a good bit of force to make them slide on the line. Take a close look at the clip in my first picture. No tying or knots needed. I've never had a decoy slide on the main line while in use. I do tie a knot in the main line where every clip goes, only to indicate where each dropper gets clipped on, as I take the lines apart for off season storage.