The Offset fixture comes with a number of methods of attachment. The system is designed so you can, in most cases, utilize the coupling bolts themselves when mounting the arm on the flange.
The built-in lasers in each turret are pre-adjusted so the laser beam represents the axis of rotation for the unit it is mounted on.
The Clock method is used to get the result.
In the Clock method, machinery positions are calculated by taking three points with 180 degrees of rotation.