For drop down pulley rigs I have a 60lb Gemini swivel at the end of my shock leader and this clips into a breakaway pulley clip. Greta rig to use in an estuary current, positions the bait away from the grip lead and ensures its close to the bottom and the pulley effect on the retrieve.
Here is an example;



The one thing I change (basically) is to replace the IMP in this clip with a Gemini swivellink to attach the lead so when the lead spins the swivel clip spins with it so the rig does not spin/twist up, this is clipped to a Gemini Splashdown or the blue gemini bait clip attached to the Gemini Springy lead system to counter strong currents.