Here are the instructions for using the Magical crimping pliers, provided by the manufacturer :

Step 1: CENTER the crimp bead in the hole and squeeze.

Step 2: The crimp bead should look like a small ravioli (four flat corners).

Step 3: Turn the bead 90 decrees and center again. Squeeze, open tool SLIGHTLY and repeat 3-4 times until the bead is rounded.

Step 4: Now it should look like a 2mm bead!