The easiest one that all of us bass fishermen carried in out pockets was called a Leroy. It consisted of a 1 or 2 ounce casting weight on a snap for sliding down our line. Just snap it on your line and pull your line straight so that the weight goes to your lure. Then you just jiggle your line up and down until it comes loose. It really works great. If that doesn't get it then use the Hound Dog on a small stout rope.