Apple ColorLaserWriter 12/600PS - Manual (Page 322)

17 Insert the shipping screw into the printer.
18 Close the printer’s door.
19 Repack the printer in its original packing material.
When the printer arrives at its new location, unpack it and set it up as
described in Chapter 1.
The screw is encased in a sheath.
Insert the sheath and turn the screw
with a coin until it is tight.
301 Packing and Moving the Printer