A method for converting a kelly rig for handling casing includes the formation of a torque reaction guide with elongate members available at a drill site including for example, any of drill collar stands, casing strings, drill pipe stands and cables held in tension. The portion of the cooling gas stream exiting the rotor chamber carries dirt particles to purge the rotor chamber. The plurality of terminals are assembled to the receiving passageways of the first receiving port and the second receiving port of the insulative housing respectively.