Method for turbine blade and assembly with dovetail arrangement for enlarged rotor groove

A method, comprising:

• providing a rotor groove defined in a rotor having an axis, wherein the rotor groove extends in a circumferential direction of the rotor, and wherein the rotor groove includes a radially inward facing rotor hook and a radially outward facing surface;
• on a turbine blade including a dovetail having a mounting arm and a single positioning leg extending from a radially inward facing end surface of the dovetail, adjusting the single positioning leg such that a first radial distance between the mounting arm and a radially inner end of the single positioning leg over a first part of the single positioning leg in at least one of an axial extent and a circumferential extent matches a second radial distance between the radially inward facing rotor hook and the radially outward facing surface of the rotor groove;
• and
• mounting the dovetail of the turbine blade in the rotor groove.