IBM ThinkPad A30 Hardware Maintenance Manual page 96

When installing: Place the CPU on the CPU socket ( 1 ),
1
1'
90
ThinkPad A30, A30p (MT 2652/2653/2654)
and then rotate the head of the screw
(A) in the direction of arrow 2 to lock
the CPU.
Removing and replacing a FRU
2
A
2'
A'