You can fish your rig either ‘semi fixed’ or ‘running’ and the main difference being that if you stop your lead or hit the clip, using a running rig will mean the hook will end-up right by the lead, whereas if you drill it in, it will end-up near the top buffer bead. Semi-fixed usually means either PVA’ing the Choddie into position where you want it or using a Naked Chod Bead set-up.
Running allows it to fly along the length of leader without resistance and both have their advantages. My choice is always dictated by whether I have to hit the clip or can allow it to drill in. Semi fixed has the advantage that you know the distance between the lead and hook is set, and in the event of a breakage the beads will separate and allow the rig to become tether free.
The running system allows the rig to slide freely to the top bead, which in my mind should be a soft rubber squash-able bead that will either pull over any knot if a leaderis used, or that the eye of the swivel can pull over in the event of a tether.