QUICKLY -- Insert the push pin back into the hole in the lighter. Make sure to push it in all the way to make a secure seal.

Before sparking your lighter, wash your hands and go to a different space to ensure no possible Butane in the air ignites.

Optional -- To finish, use the wire cutters to shorten the push pin and file it smooth with the metal file. Make sure to leave some of the plastic from the push pin to help the lighter remain sealed.