The detectors were moved into the beam axis using the motors to check the maximum distance they can be moved in without collision with one another. 

Movement of both pneumatic motors results in a separation of ~ 4 cm between the detectors.

The servo motors for left and right were each moved in by 1 cm -> results in separation of 2 cm between the detectors

The servo motors for left and right were then each moved in by 5 mm -> results in separation of 1 cm between the detectors

The separation between the jacking plate of one of the detectors and the side of the adjacent detectors is closer than the separation of the detector silicons. The detectors could not be moved in any further than this to avoid collisions from the jacking plate

Attached are photos after movement of the detectors. Parallax may affect the distance on the ruler in the photos. 

During beam time -> Maximum distance that can be moved on the servo motors is 30 mm combined for left and right. (15 mm left and right or 10 mm left, 20mm right etc)