An assembly comprising: a male electrical connector including: a first electrically insulating body having a first base mating surface and a first stepped mating surface offset from the first base mating surface; a first electrically conducting pin extending from the first base mating surface; and a second electrically conducting pin extending from the first stepped mating surface; and a female electrical connector including: a second electrically insulating body having a second base mating surface and a second stepped mating surface offset from the second base mating surface; a first electrically conducting socket extending from an interior portion of the second electrically insulating body to the second base mating surface; and a second electrically conducting socket extending from the interior portion of the second electrically insulating body to the second stepped mating surface, wherein the male electrical connector is removably connected to the female electrical connector such that the first pin is in the first socket, the second pin is in the second socket, the first base mating surface is positioned near the second base mating surface, and the first stepped mating surface is positioned near the second stepped mating surface, characterised by further comprising first and second mechanical couplings (30, 42) and a bushing, with the first and second mechanical couplings (30,42) coupled together and positioned inside and rotatable with respect to the bushing and having a hole (66,68) extending through the first and second mechanical couplings, wherein the male and female connectors are positioned in the hole; and wherein an inner surface of the hole (68,70), an outer surface of the first electrically insulating body, and an outer surface of the second electrically insulating body are all substantially kidney-shaped. a male electrical connector including: a first electrically insulating body having a first base mating surface and a first stepped mating surface offset from the first base mating surface; a first electrically conducting pin extending from the first base mating surface; and a second electrically conducting pin extending from the first stepped mating surface; and a first electrically insulating body having a first base mating surface and a first stepped mating surface offset from the first base mating surface; a first electrically conducting pin extending from the first base mating surface; and a second electrically conducting pin extending from the first stepped mating surface; and a female electrical connector including: a second electrically insulating body having a second base mating surface and a second stepped mating surface offset from the second base mating surface; a first electrically conducting socket extending from an interior portion of the second electrically insulating body to the second base mating surface; and a second electrically conducting socket extending from the interior portion of the second electrically insulating body to the second stepped mating surface, a second electrically insulating body having a second base mating surface and a second stepped mating surface offset from the second base mating surface; a first electrically conducting socket extending from an interior portion of the second electrically insulating body to the second base mating surface; and a second electrically conducting socket extending from the interior portion of the second electrically insulating body to the second stepped mating surface, wherein the male electrical connector is removably connected to the female electrical connector such that the first pin is in the first socket, the second pin is in the second socket, the first base mating surface is positioned near the second base mating surface, and the first stepped mating surface is positioned near the second stepped mating surface, characterised by further comprising first and second mechanical couplings (30, 42) and a bushing, with the first and second mechanical couplings (30,42) coupled together and positioned inside and rotatable with respect to the bushing and having a hole (66,68) extending through the first and second mechanical couplings, wherein the male and female connectors are positioned in the hole; and wherein an inner surface of the hole (68,70), an outer surface of the first electrically insulating body, and an outer surface of the second electrically insulating body are all substantially kidney-shaped.