IBM 9080-M9S Manual page 627

Figure 543. Installing the heat sink on the TIM
n) Tighten the center load screw clockwise by using the supplied hex key as shown by (B) in the
following figure until a firm stop is reached. If the heat sink moves noticeably, the load arms are
not engaged. Unscrew the center load screw and repeat this step again.
System backplanes 621