A forum member PM'ed me about pulley rigs, but I couldn't figure out how to post images in a PM, so thought I'd just throw a new topic up.
Here's a whole rig, I always use 80lb mono for the sinker trace, and for mullys often the hook trace is the same, but sometimes 60 or even 100 or wire if the toothies are around. The hook trace must be a bit shorter than the sinker trace.
This is a closeup of the Gemini clip, the swivel that acts as the pulley, and the beads on either side that protect your knots. I use a big swivel because the eye is thicker and doesn't beat up the mono as much, after a few good fish you may need to replace the rig, better than losing the fish of a lifetime. Always use good quality stainless steel swivels, brass swivels are crap and have no place in saltwater fishing.
Here's the hook sitting in the Gemini clip attached to a sinker. It's a 7/0 Gamakatsu octopus circle. The weight of the sinker pulling down keeps the hook engaged. When the whole thing hits the water they separate and your hook and bait drift free.
After casting let your sinker bed itself then wind up the slack, have your drag tight enough to set the circle hook but not so much that a good fish pulls your setup into the sea. The design will allow a fish to pickup the bait and move a bit before the tension sets the hook in the corner of it's jaw. Another bonus is that the sinker is up away from the fish and the seabed on the retrieve.
