My XM leash won't stay together. There is a brass ball that fits into a brass receiver (for lack of better words) and it will no longer stay together. I liked the fact that my leash did not tangle but it's only 1 1/2 years old and it's done. I'm gonna whack it with a hammer a few times and hope for the best. Any preferences on a leash? Any to stay away from? tanks.