http://www.pcstats.com/articleview.cfm?articleid=2 231&page=6

Hlavně si povšimněte této pasáže:

Ensure that the black top of each fastener is rotated into the correct locking orientation, with the arrow pointing away from the heatsink, and the groove in the top oriented towards the center of the heatsink as illustrated below. This orientation ensures the fastener will lock into place when pressed down.