IBM 9080-M9S Manual page 603

Figure 519. Lowering the removal tool onto the system processor module
i) 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 as shown in the following figure.
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 ring until directed to do so later.
System backplanes 597