Potaire, take about 12" of 15lb line and run it through the swivel eye. Then grab both line ends between respective forefingers and thumbs and start twisting. What will happen is the line will spiral with the swivel centered at the middle. Ironically I developed this setup specifically for Barrier. The reason I started using heavier leadline (I typically use 10lb main here) is that the rig is so snag-resistant that I was losing more lead to the leadline wearing down, so I upped the poundage and doubled it. This rig slides well over those flat, round rock there and outfishes slinkies.

PS how's the fishin been down there?