* put the heatspreader into the tray * apply glue * apply thermal compund either on the cpu or the heatspreader * put the CPU into the tray * put the Cover over the Tray ensure that the Notches of the CPU PCB are at the same place of the notches of the tray ! * move the clamp over the "sandwich" , probably best would be sideways ? Ensure that you print it at high quality and test if the CPU will really touch the Heatspreader, otherwise it may damage your CPU when glueing it with a gap in between. As always use at your own risk ! some sort of glue ?