I made one very simular to that, not quite as fancy. I just took the two pieces of wire, wrappped them around a rod to form loop and teisted them a few turns, and then bent the hooks, They will usually straighted out and come free from anything heavy. I usually have a cat rod with me and use that to cast it with. It has found 3 rods for my brother, but the two I lost, didn't find. I wasn't sure where one was, and a nice??? cat was on the other. One of my brothers rods had a 7# cat on it. When they are agressive, don't set it down without being in a rod holder!!! I knew better and lost one anyway.