k: if youre using a wedge with any kind of string , especially waxed A.Sinew , then you have to get a small wrap on the bow itself below the wedge , or it will slide down no matter what (unless your tips taper like crazy). if your bow is smooth , and even in width and thickness , string will always slide.
couple wraps at the botton and a drop of superglue give you temporary assurance , while a nice bead of superglue would make it more permanent , but still very easily removed.
there are also others who use 2 or 3 sets of nocks , kind of like an adjustable.
-hov