sleeve transfers torque to the screw tip in this embodiment the rigid core remains stationary and preferably engages to the inner portion of an articulated driver to prevent precession of the screw itself while the outer portion of the articulated driver transfers torque to the head of the screw in another embodiment of the present invention the flexible sleeve is attached to a drill bit at its first distal end and attached to a drill bit drive access at its second proximal end the diameters of the drill bit and drill bit drive access are preferably larger than the diameter of the flexible curved sleeve as the proximal end of the drill is driven by hand or auxiliary power source the flexible sleeve then transfers the torque to the drill bit as depicted in fig9 in another embodiment of the present invention the flexible sleeve is externally threaded 14 the threaded sleeve is preferably made of a spiral thread that articulates with a plurality of rings 15 preferably equally spaced on the thread to prevent unraveling of the thread when the curved assembly is advanced as depicted in fig9 each individual ring 15 holds the thread to the rigid curved core and minimizes the possibility of unraveling of the thread the thread and the rings articulate via a single peg 16 which is wider at its ends than its shaft and is positioned to maintain the spiral thread 14 in close relationship to the ring 15 and to the curved inner member in another embodiment of the present invention ring 15 is further comprised of a locking mechanism such as for example a pin and aperture that snap together along the circumference of the ring to prevent the ring.