Fortinet FortiTester 2000E Quick Start Manual page 8

Push the safety lock forward to secure
4. To mount the chassis into the cabinet, first ensure that the ball retainer is
in the fully open position. Then, insert the chassis (inner) member into
the cabinet member. When you push the chassis back into the cabinet,
press the trigger down to release the slide from the locked position.
8
Release safety lock
before mounting
Retainer is in fully open position
Press trigger down to unlock slides