See Thumper for the general location.From Thumper, "adventure hike" about 100 yards north to a fern covered talus slope. On your left (west) will be the massive slab of the 4th Flatiron. On your right is a west facing vertical wall containing 4 routes. This is the rightmost route and is located near a tree. 2 bolts and gear take you to a rappel anchor.
Technically, I believe this climb (as well as "DC Boy", "Hoppy Birthday" and "Hop, Skip and Jump" are on the west side of the lowest piece of the Fourth Flatiron. To get to the base, you can either go between the Lower Tangen Tower and the Fourth Flatiron (on the Tangen Tunnel route) or leave the Royal Arch Trail later and head north between the Tangen Towers and past Thumper as described.