Samsung SyncMaster 403Tn Owner's Manual page 25

parts of the right bracket should form a
regular triangular shape.
Machine Screw(1)
For the bracket assembly, locate parts properly by
distinguishing them using inlayed L(left), R(right), TOP
(top), and BOT(bottom) markings.
Fix the VESA Bracket onto the assembled
Main Bracket. Be sure that the VESA
Bracket is placed correctly not to confuse
front and back side of the VESA bracket.
Machine Screw(2)
Secure the bracket onto the backside of the
LCD Monitor using screws.
Machine Screw(1)
Dimensions