then addressing the retaining structure of the accessory mounting mechanism to a bore formed through the frame of the vehicle so as to secure the accessory thereto application_number US 30068602 A description although the disclosure hereof is detailed and exact to enable those skilled in the art to practice the invention the physical embodiments herein disclosed merely exemplify the invention which may be embodied in other specific structure while the preferred embodiment has been described the details may be changed without departing from the invention which is defined by the claims an accessory mounting mechanism 10 of the present invention may be seen in its component parts in fig1 the accessory mounting mechanism 10 comprises a lower grommet 12 an upper grommet 14 a fastener 16 and a cap 18 the accessory mounting mechanism 10 is adapted to secure an accessory 20 to the substrate 22 of a vehicle note that as used herein the term u201c substrate u201d is used to denote the frame of an automobile or any other structure to which an accessory 20 need be attached note also that the substrate 22 may comprise distinct layers and in addition to a metallic frame may also include a fiberboard and fabric headliner 24 of the type commonly used to finish the interior.