NEC N8100- 1241F User Manual page 86

3-18 Setting Up Your Server
5.
While pushing the levers, move the removed rail assemblies toward the direction
indicated by an arrow in the figure, to restore the original position.
IMPORTANT:
The removed rail assemblies are to be installed on the inner rails
later. To install each rail assembly on the correct inner rail, make a
mark on the assemblies. Similarly, when installing more than one
server, distinguish between the pairs of inner rails and rail
assemblies of the servers by making marks.
Be very careful not to get your finger caught in the levers or rails.