Asus KCMA-D8 - Manual (Page 33)

ASUS KCMA-D8 2-15
2. Attach one end of the retention
bracket to the retention module
base.
3. Align the other end of the retention
bracket to the retention module
base. A clicking sound denotes that
the retention bracket is in place.
4. Push down the retention bracket
lock on the retention mechanism
to secure the heatsink and fan
assembly to the module base.
Ensure that the heatsink and
fan assembly perfectly fits the
retention mechanism module
base, otherwise you cannot
snap the retention bracket in
place.