Abstract: A rotary machine and a method of assembling a rotary machine having a casing extending at least partially around a rotor are provided. The method includes providing a diaphragm patch ring. The method also includes assembling a diaphragm assembly by configuring a diaphragm bore portion to receive the diaphragm patch ring and forming a diaphragm patch member sub-assembly by coupling the diaphragm patch ring to the configured diaphragm bore portion, such that the diaphragm bore portion defines at least one dowel passage and at least one bolt passage. The method further includes inserting at least one dowel generally radially into the at least one dowel passage, inserting at least one fastening bolt generally radially into the at least one bolt passage to secure the diaphragm patch ring to the diaphragm bore portion, and positioning the diaphragm assembly in a gap formed by the casing and the rotor.