Method of forming a rivet using a riveting apparatus

A riveting yoke assembly ( 11 ) comprises a yoke ( 30 ), a force applying mechanism ( 22 ) and a rivet forming device ( 34, 36 ). The yoke has a first end ( 38 ), a second end ( 40 ), and a middle section ( 42 ) coupled between the first and second ends ( 38, 40 ). An opening ( 44 ) is formed through the yoke between the first and second ends. The force applying mechanism ( 22 ) is coupled to the first end ( 38 ) of the yoke ( 30 ). The lower rivet forming device ( 36 ) is removably coupled to the second end ( 40 ) of the yoke. The lower rivet forming device ( 36 ) has a base end ( 46 ) attached to the second end ( 40 ) of the yoke ( 30 ) and a forming end ( 48 ) with a recess ( 50 ) to form rivets ( 17 ). The recess ( 50 ) has a concave, interior surface ( 52 ) having an annular step ( 54 ) positioned between a top edge ( 56 ) of the interior surface ( 52 ) and a bottom-most point ( 58 ) of the interior surface ( 52 ) in order to properly align the rivet ( 17 ).