An energy generating unit for a wind turbine, comprising: a generator and a gearbox operatively connected together, a supporting structure that extends into the energy generating unit, wherein at least the generator includes internal components that may require assembly and disassembly for repair or replacement; and a tool fixture configured to support one or more assembly tools used to assemble and disassemble the internal components from within the energy generating unit, the tool fixture comprising: a main body including a support aperture engaging the supporting structure that extends into the energy generating unit; and a tool receiver configured to secure one or more of the assembly tools against magnetic forces that may be present inside the generator, wherein the tool fixture is pivotally movable relative to the supporting structure so that the assembly tools secured to the tool receiver may be moved between a first position in which the tool fixture and the assembly tools can move along the supporting structure into and out of the energy generating unit, and a second position in which the tool fixture positions the assembly tools to reach and work on fasteners located on the internal components within the energy generating unit. a generator and a gearbox operatively connected together, a supporting structure that extends into the energy generating unit, wherein at least the generator includes internal components that may require assembly and disassembly for repair or replacement; and a tool fixture configured to support one or more assembly tools used to assemble and disassemble the internal components from within the energy generating unit, the tool fixture comprising: a main body including a support aperture engaging the supporting structure that extends into the energy generating unit; and a tool receiver configured to secure one or more of the assembly tools against magnetic forces that may be present inside the generator, wherein the tool fixture is pivotally movable relative to the supporting structure so that the assembly tools secured to the tool receiver may be moved between a first position in which the tool fixture and the assembly tools can move along the supporting structure into and out of the energy generating unit, and a second position in which the tool fixture positions the assembly tools to reach and work on fasteners located on the internal components within the energy generating unit. a main body including a support aperture engaging the supporting structure that extends into the energy generating unit; and a tool receiver configured to secure one or more of the assembly tools against magnetic forces that may be present inside the generator, wherein the tool fixture is pivotally movable relative to the supporting structure so that the assembly tools secured to the tool receiver may be moved between a first position in which the tool fixture and the assembly tools can move along the supporting structure into and out of the energy generating unit, and a second position in which the tool fixture positions the assembly tools to reach and work on fasteners located on the internal components within the energy generating unit.