Using a Phillips screwdriver, unscrew the screws securing the storage shelf:
to the radio mount panel (one self-tapping screw),…
... sidewall upholstery (two screws) …
... and to the bulkhead bracket (one self-tapping screw).
Lower the right end of the shelf.
We remove the spike of the shelf from the radio receiver mounting panel..
... and remove the shelf.
Install the shelf in reverse order. First, it is convenient to make all the screws, and then tighten them.