[f5fstop]

Mine has a metal C-clip, inside the door, holding the lock cylinder to the rod.
From what I have learned this is what happens, and why there is a plastic clip laying on the ground, near the vehicle.
The lock cylinder is shipped to the plant, separate from the door (Naturally). During shipment, the lock cylinder is held in place to the lock sleeve with a plastic clip. Upon installing into the door, the rear of the cylinder goes through a metal rod/cable, and at that point the metal C-clip is installed. However, the plastic clip is still there,between the end of the sleeve and the rod, but serves no purpose; other than its original purpose to hold the cylinder in the sleeve during shipment from the lock cylinder manufacturer.
Now, could the C-clip have fallen off if not installed correctly at the plant? Sure, it might happen, but then the lock would obviously be loose.
What gets me curious, is the guy never says they were caught, and he only assumes a screwdriver was used. In less than fifteen seconds, I can screw in a slide hammer and pull the lock cylinder out, leaving no damage to the door. This is true on almost any vehicle made, by any vehicle manufacturer.
If I used a slide hammer, most likely the plastic shipment clip would come out with the cylinder and sleeve, while the clip, which is located behind the rod, would fall down inside the door. Unless you removed the door panel, you would not see the metal clip.
As for a class action suit, the guy needs to obtain the number of plaintiffs, so directed by the court, before a class action can be filed.

So, unless GM has changed their installation and started using a platic C-clip, this complaint is frivolous. In addition, door locks must meet FMVSS standard 206 for door retention. This includes the retention of the door to remained locked during a side collision. There are currently plastics on the market that would probably hold as good or better than a thin metal C-clip.