I like to bring a couple toothpicks with me and lightly wedge the tip inside the corkie to keep it from sliding up and down my line. This way it stays just above the hook. Just don't jam the toothpick in too hard or you may damage and weaken your leader. If you forget or don't have toothpicks you can snap off a little twig and use it instead. I use them when I drift fish to keep my gear a little above the bottom.