IBM eServer 240 xSeries User Reference Manual page 186

2. Remove the wheel-shaped knobs from the server. Store the knobs in a safe
3. Press the safety latches on the slide rails 1 and slide the server about
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IBM xSeries User's Reference
d. Attach the rails to the sides of the server with M4 by 5-mm screws.
place to use if you need to remove the server from the rack at a later time.
halfway into the rack enclosure.
Note: When the server is fully extended, safety latches on the slide rails lock
into place. This prevents the server from being accidentally pulled out
too far and dropped. To release the safety latch, press in.