What does the 'tail of the rivet' refer to in the hand riveting process?

The term 'tail of the rivet' specifically refers to the end of the rivet that is opposite the manufactured head. In the hand riveting process, this tail is the part that is swelled or deformed to secure the rivet in place after it has been inserted into the drilled hole. When a rivet is installed, the tail is shaped into a pattern that creates a strong mechanical bond between the rivet and the materials being joined. Understanding this terminology is crucial for anyone involved in aviation maintenance and assembly, as it relates directly to the effectiveness and integrity of the riveted joint. The other choices describe different aspects of the riveting process but do not define what the 'tail' specifically is. For example, the hole drilled for installation is a necessary part of the process, but it does not pertain to the rivet itself. Similarly, the flush surface and the portion that secures the fastener are relevant concepts but do not capture the essence of what constitutes the 'tail' of a rivet.