IBM EXP15 Hardware Maintenance Manual page 87

Note
Use clip nuts if your rack has round holes. If
your rack has square holes, you can use the rack
insertion tool or a flat-blade screwdriver to install
cage nuts.
Cage
nut
2. On the rail marked L, remove and save the small
screw 1 ; then, loosen the four large screws 2 .
3. Hold the rail against the outside of the left rack
mounting flange and loosely insert the front black hex
screws 3 .
Netfinity FAStT EXP500 - Type 3560
Clip
nut
L
79