IBM xSeries 300 Hardware Maintenance Manual page 58

front of the clip.
If the handle breaks, remove the handle by placing a screw driver in between
both sides of the handle as in the picture above, and twist the screw driver to
break off the handle to relieve the pressure from the clip to the heat sink, as in
the picture below.
CAUTION:
Exercise extreme caution when removing the heatsink. Be careful not to
damage the system board or processor beneath.
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Hardware Maintenance Manual: xSeries 300