Juniper JSA5800 Hardware Manual page 35

d. Insert the rear hooks of the outer rails into the rear slots of the rack, and use the screws to secure
the rear of the outer rails to the rack, as shown in
Figure 11: Inserting the Front and Rear Mounting Rails
3. Slide the middle rails away from the rear of the outer rails.
4. Position the ball-bearing shuttle at the front of the middle rails.
Figure 11 on page 29.
29