Oki LE810DT User Manual page 27

If the back plate is on your printer, perform the following step; other wise, skip to step 3.
2. Remove the back plate covering the access hole.
a. Press on the pin holders (1) inside the printer at either end of the bracket
until the pins extend from the outer housing.
b Carefully pull out the pins at either end of the cover plate and save them.
You will need the pins if you ever decide to reinstall the back plate.
c Remove the plate from the printer.
Save it with the pins: you will need them should you ever decide to reinstall
it.
LE810DT User's Guide 27