A swivel mechanism (20; 120) for allowing rotation of a seat in an automotive vehicle, the swivel mechanism (20; 120) comprising: a first plate assembly (22; 122) coupled to a second plate assembly (24; 124) to facilitate axial rotation of one of the first and second plate assemblies relative to the other of the first and second plate assemblies; and a locking and stabilizing structure comprising a lock pin extending from the first plate assembly (22; 122), a lock plate slidably coupled to the second plate assembly (24; 124) for movement between a locked position in which the lock plate is engaged with the lock pin to prevent rotation between the first plate assembly (22; 122) and the second plate assembly (24; 124), and an unlocked position in which the lock plate is disengaged from the lock pin to allow rotation of one of the first and second plate assemblies relative to the other of the first and second plate assemblies, characterized by a wedge slidably coupled to the second plate assembly (24; 124) for movement between a cinched position in which the wedge is frictionally engaged with the first plate assembly (22; 122) to stabilize the swivel mechanism (20; 120), and an uncinched position disengaged from the first plate assembly (22; 122) to allow unimpeded rotation of one of the first and second plate assemblies relative to the other of the first and second plate assemblies. a first plate assembly (22; 122) coupled to a second plate assembly (24; 124) to facilitate axial rotation of one of the first and second plate assemblies relative to the other of the first and second plate assemblies; and a locking and stabilizing structure comprising a lock pin extending from the first plate assembly (22; 122), a lock plate slidably coupled to the second plate assembly (24; 124) for movement between a locked position in which the lock plate is engaged with the lock pin to prevent rotation between the first plate assembly (22; 122) and the second plate assembly (24; 124), and an unlocked position in which the lock plate is disengaged from the lock pin to allow rotation of one of the first and second plate assemblies relative to the other of the first and second plate assemblies, characterized by a wedge slidably coupled to the second plate assembly (24; 124) for movement between a cinched position in which the wedge is frictionally engaged with the first plate assembly (22; 122) to stabilize the swivel mechanism (20; 120), and an uncinched position disengaged from the first plate assembly (22; 122) to allow unimpeded rotation of one of the first and second plate assemblies relative to the other of the first and second plate assemblies. a lock pin extending from the first plate assembly (22; 122), a lock plate slidably coupled to the second plate assembly (24; 124) for movement between a locked position in which the lock plate is engaged with the lock pin to prevent rotation between the first plate assembly (22; 122) and the second plate assembly (24; 124), and an unlocked position in which the lock plate is disengaged from the lock pin to allow rotation of one of the first and second plate assemblies relative to the other of the first and second plate assemblies, characterized by a wedge slidably coupled to the second plate assembly (24; 124) for movement between a cinched position in which the wedge is frictionally engaged with the first plate assembly (22; 122) to stabilize the swivel mechanism (20; 120), and an uncinched position disengaged from the first plate assembly (22; 122) to allow unimpeded rotation of one of the first and second plate assemblies relative to the other of the first and second plate assemblies.