Exabyte 230D Library Installation And Operation Manual page 59

Installation and Setup
If necessary, manually rotate the drum to access the mounting
plate where you want to install the magazine.
Locate the roller at the top of the magazine mounting plate.
Position the magazine so that the single mounting guide on
the magazine is aligned with the roller on the mounting plate,
as shown in the figure.
Insert the bottom end of the magazine first, then snap the
magazine into place by pressing against the top.
Repeat steps 3 and 4 until you have installed all of the
magazines.
Close and lock the library door.
Installation and Operation 45