IBM Power System Series Manual page 273

Figure 222: Lowering the removal tool onto the system processor module
c) With the removal tool sitting on top of the system processor module, push down on the ring (A)
slightly so that the blue tabs (B) snap outward and the jaws engage with the system processor
module (C) as shown in Figure 223 on page 270.
Make sure that both of the tool jaws are locked onto the system processor module by pushing down
on the tool.
Important: Do not press the blue release tabs until directed to do so later.
System processor modules for the 9040-MR9 269