Abstract: A device for torquing and untorquing visable or hidden nuts or both disposed on a common circle of centers in the rotor assembly of a jet engine wherein said device comprises a bolt locating platform disposed outside of said rotor assembly, a trunnion assembly rotatably disposed within said rotor assembly, a connector between said platform and said trunnion assembly, a torquing assembly disposed on said platform and extending through and beyond said trunnion assembly, a torque box having a nut socket disposed thereon, said torque box being operably connected to said torquing assembly, a nut inserter assembly for transferring a nut from outside of said rotor assembly to a point within said assembly where said nut is transferred to the nut socket on said torque box and ultimately to a bolt within said rotor assembly and means operably connected to said device for monitoring and measuring the following parameters: bolt location, prevailing torque, applied torque, applied turn angle and/or breakaway torque.