Interior centerline based seating method

An interior centerline based seating method for use in combination with a work piece having an internal cavity with a cavity side wall and with a throat at one end and a cavity end wall at the other end comprising the steps of:

• seating the work piece on a post shaft having a first end and a second end within the internal cavity with said first end of said shaft contacting the cavity end wall;
• biasing a plurality of pivot bars rotatably connected to said post shaft between said first end and said second end of said post shaft in a retracted position;
• biasing a plurality of clamp bars seated within said post shaft between said pivot bars and said second end of said post shaft in a retracted position;
• and,
• activating a push rod positioned within said post shaft from a non-engaging position to an engaging position causing said pivot bars to rotate to an expanded position of contacting the cavity side wall and said clamp bars to move outwardly to an expanded position of engaging the throat of the internal cavity.