to fins 72 in fig8 for example and they hold the eccentric disc in the proper position however when latch 101 is activated to rotate eccentric collar 120 by turning the drill string in the opposite direction i e to the left the fins 130 will function the same way as fins 72 and permit the turning until the eccentric collar is properly oriented in the same manner as described above in regard to fins 72 experience has indicated that other methods of starting the drilling of the curved portion of the lateral drainhole can be employed in the present invention thus the apparatus and method can be used in either an open hole or cased well bore wherein a window is cut in the casing further the process can be initiated from a packer with cement plug as previously illustrated or with the use of a deflector or whipstock or from the bottom of an open hole or the like however the use of a whipstock is not necessary further various types of flexible or resilient drilling string sections flexible joints reamer or drill bit collars with stabilizers and drill bits can be used all as generally known in the art the following table summarizes one set of typical dimensions for a commercial unit as illustrated in fig2 as such these dimensions should be viewed as being illustrative of one particular preferred embodiment but not limiting thereto table______________________________________diameter.