Electronics » Re-keying a GPS mount

Having a discarded GPS cradle I decided to investigate the re-keying process for this item. First of all, we are looking for the means of access to the "keeper" tumbler ("Stop plate" in BMW-speak) that locks the cylinder in the bore. This is item 3 in the following BMW diagram,
BMW Lock Tumbler Coding.jpg - Bild entfernt (keine Rechte)

The GPS cradle is shown below, with the lock cylinder access cover removed. The clock cylinder cover attach with two T7 screws. The vacated mounting points in the GPS cradle are directly above the detached cover. As shown, the key is in the locked position.
IMG_0942.jpg - Bild entfernt (keine Rechte)
Or, in close-up
Close-up.jpg - Bild entfernt (keine Rechte)

At this point, rotate the key to the unlocked position and remove the end cover which functions as the locking mechanism for the sliding bar ("Shut-off" lock in BMW-speak). When viewed from below the cradle, you see the "keeper" tumble in the bore of the lock cylinder cavity,
Cylinder Bore with Note.jpg - Bild entfernt (keine Rechte)
Depress the "keeper" tumbler with a small screwdriver or small knife blade and gently pull the key away from the cradle. The lock cylinder will slide out of the lock bore. Beware, you must capture the individual tumblers as they are exposed from the bore.

At this point, the lock cylinder tumblers can be reshuffled or replaced to match a new key.