Abstract: A module exchange system including a module manipulator mechanism for use in manipulating modules between a module storage magazine and a satellite. The manipulator includes an adjustable terminal device which is capable of accommodating satellite modules of different geometrical proportions and a latching probe mechanism for releasably latching the modules with respect to the satellite and the module manipulator. The module manipulator is designed for movement along three mutually normal axes and is rotatable about one axis. The adjustable terminal device comprises two pairs of mutually crossed angularly adjustable arms having fingers at their outer ends for securing the modules, the arms being mutually angularly adjustable with respect to one another and telescopic so that the positions of the fingers may be adjusted to be received by modules of different proportions.