The Main Pinnacle Ridge is located above the Skull formantion. From the meadow below to the south, hike up a climbers trail heading north and around the Skull's west side. Once on the backside of the Skull, continue north through faint trail networks the formations above (Pinnacles #1-6). Cross through a corridor (some scrambling required) and reach the north side of these pinnacles. Once there, the pinnacle are identifyed by looking at their north faces. Pinnacle #1 is the far left formation, then #2 is the next formation to the right, as are the remaining pinnacles. Arrowsphere is located on the right side arete of the north face of Pinnacle #2. As a side note, there is an excellent 3 bolt route on the left arete of Pinnacle #2, checking in at .10b (unknown FA and route name, probably put up by Pat Brennan).