Carefully open the loop slightly, by twisting it open.
Pro Tip: Tip - Do not pull the loop apart, as this will weaken the wire and cause the loop to become misshapen.
Re-insert the mandrel so that you do not distort the shape of the bail wire while you work. Thread the bead onto the wire, so that the front of the bead is facing the same direction as the straight wires are pointing.
Close the loop again by pinching or twisting closed with the chain nose pliers.