A method and apparatus for installing a frangible collar onto a fastener installed in a hole using an end effector in which rotation of the fastener is not restricted by the hole. Rotation of the fastener may be restricted using the end effector. A frangible collar may be installed onto the fastener by an element installer of the end effector while the while restricting rotation of the fastener. A frangible portion of the frangible collar may be sheared off by torqueing the frangible portion using the end effector.