Follow the left-leaning crack to the terminus of the crack, 15' up. The crack itself tends to be dirty and lichen covered, and the landing can be bad.
Despite the "crack" name, face moves up a slab dominate the movement up this problem.
Follow the trail into Rounded Boulders Area. After passing the clearing and heading into the center of a dense collection of boulders, one tall(er) boulder will be on your left. Follow this boulder around to the left and you will find this left leaning crack. Walking past the crack will lead you to the Black Mountain testpiece "Bang On".
The downclimb is this crack, or you can downclimb the slab towards a tree and chimney down between the tree and the boulder.