A mounting apparatus for mounting a hollow work-piece on a machine includes a
circumferential
groove formed into an outer surface of a cylindrical supporting fixture of the
machine, a dampening plug assembly for positioning inside the hollow workpiece
adjacent the cylindrical supporting fixture, and an end pressure reducing device
for mounting within the circumferential groove for centrifugally supporting and
enabling the reduction of machining-induced pressure from the end of the hollow workpiece.
