Lexmark 4I3 - Manual (Page 27)

7. Consult the following figure and then find the large orange knob
and orange shipping brace in the center of the printer. Unscrew
the knob and remove the knob and shipping brace from the
printer.
S h ip p in g
B r a c e
Note: Save the shipping brace in case you relocate the printer.
Chapter 1. Setting Up the 4230 Printer 1-5