Here is a little sliding clip you can make your self to dump the sinker if you have a fish on and the sinker is stuck. I use it on the normal running trace, but i insert a bead first that stops at the leader knot (+/- 8meter) from your hook swivel. This gives the fish some distance to take the bait and when hooked and the sinker is stuck it will release there, dumping the sinker and leaving you to fight the fish freely.