Never had to buy a string for my jennings till now. I was looking my bow over and putting everything away when I saw that the string, on the end where it goes around the little stud on the cam, is frayed. Two strands appear to be broken so I assume its not safe to shoot. What' s the best string? Where can I get one? and how much should this thing cost me? It' s a used bow with Hatchet cams if that helps.