Courtney P., taking a bit of a rest after pulling ...
This is route #18 in the on-line guide, which calls it "The most classic and popular route at Potrillo, with a wide variety of climbing techniques in a short distance." The Pillars of Hercules route is easily identified by the two massive buttresses that mark the prow of the cliff. The climb has two start variations; both starts lead to the base of a broad chimney betwixt the two mighty pillars. This right start variation requires one first to mantle onto the right side of the large, flat-topped boulder/pillar that marks the base of the climb. The crux is moving off the right side of this boulder, getting to a stance below the twin fist cracks in the back of the broad chimney. The left twin crack seems to protect better.
This is the leftmost (westernmost) route on the south wall.
The crux is fairly easily protected, but a fall here will very possibly land you back on the flat-topped pillar. The top twin cracks eat up medium/large cams. Popular to top-rope; a 2-bolt anchor, reachable from the top, was recently re-installed (please don't sling the tree anymore). There's also abundant opportunities for a gear anchor on top if you like.
Photos of Pillars of Hercules (right var.) Slideshow