In a gas turbine having a chordal hinge seal between an inner rail of each nozzle segment and an annular axially facing sealing surface of a nozzle support ring, a supplemental seal is disposed between the support ring and inner band of the nozzle segment on a lower pressure side of the chordal hinge seal. A method of using the milling machine is also provided. The two rows of posts are laterally offset from one another to facilitate attachment and removal of a loop in the distal end of the leader. The facet-based user interface and logic-based user interface may be accessed via a unified user interface.