The Eyepiece Leveler Bracket Base is the mounting base for fitting an eyepiece leveler to an OConnor pan and tilt head. It provides the base-level interface between the leveler accessory and the head, rather than the complete leveler unit itself. It attaches to the tripod with two #10-24 x 1/2-inch screws and adjusts in two directions, and ships with four #10-24 x 1/2-inch socket-head cap screws and one OConnor 1030/1040 Fluid Head Adapter.