The following are pictures of the engineering model of the picosatellite launch mechanism. This was built prior to the flight models to perform extensive testing and design verification.
 
 

Closeup of door and latch. The door is the original design and does have the modication to allow post-delivery picosatellite installation. The door also does not have the extra bevels for containment.

Another closeup of door.

These are the door release cables that attach to the door attach and the nonexplosive actuator. The cable runs from the back of the tube to the front through a channel in the aluminum railings.

This is the pusher plate the ejects the picosatellites. This is the front side that cups around the picosatellite. The screws prevent the pusher plate from existing the tube during pico launch.

This is the backstop that places the picosatellites in tension to confine them during launch. The wedge forces the pusher plate and picosatellites into the rails locking them down for launch. Behind the backstop is a set of bevel springs that allow some compliance in the picosatellite confinement.

This is the engineering model minus the springs in a partial state of assembly. The top, black door is the orginal door. The bottom, silver door is the new design.

The engineering model launcher with one spring in place.

This is the non explosive actuator used to release the pico doors. It is a split spool actuator built by NEA.