In the chimney II

A view of the upper half of the chimney. The chockstone in the bottom of the photograph takes low-5th Class climbing to get past on the right wall. If you bypass the 5.4 crux at the base of the wall, this chockstone becomes the new crux.

Up above is a keyhole. There are actually two keyholes in the final chockstone. The one visible here is not the one you climb through (unless you want to make things more difficult). The actual keyhole is on the left side as you climb up.