Step 6: Aluminum work
Draw a cross on the heat sink which connects the corners and mark 1 cm from each corner. Drill a 5 mm hole on each mark.
Draw a 1,5 cm by 1,5 cm square in the middle of the heat sink. Drill a 2,5 mm hole in each corner of the square.
Drill a 5 mm hole in the middle of the aluminum disk. Screw a 1,5 cm piece of screw-thread in the hole. Sand the disk until it is smooth.