Take one of the big paper clips clips and unfold it. then cut it like so. Take the big half and bend it evenly into a u shape. Then take the little end and trim the ends even to about a 1/2 inch long.
Now to make the trigger, take the scrap or a new paper clip and bent the tip down. Go a little ways back and bend a small hole.
Now leave about a 1/2 an inch at the end and cut off the excess.