The Left Tower stands left of the other posted routes (1/2012), about two thirds of the way up the hill. It has an intriguing shape, even looks like a molar when viewed from the top of Upper Dome.
Rap off the right (~east) side of the tower with a 60 meter rope on beefy bolts with quick links and ovals. Not sure whether a rap on a 50 meter rope would reach okay - might.