Ball, snubber, loop of the heavy braided white gangion (used for halibut leaders on commercial boats), double uni knot from braid to gangion.
Put a figure 8 knot in the bottom of the loop to keep the swivel on the snubber in place, connect the two ends of the gangion with a lover's knot. Measure your loop. Some like the ball to stay in the water so it doesn't bang, others want it to swing around in the air so it doesn't affect the fishing line.
The doubled over spot where the braid connects to the gangion is thick enough to stop the downrigger, but thin enough to come through the pulley. And the thicker white gangion won't be cut by the braid as the green stuff might be.
Clip the release clip onto one arm of the white stuff just below the join.