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. <EOS>