for drift the complexity of these electronics can vary from a single accelerometer to a full d amp i package ie three or more accelerometers and or three or more magnetometers or more the determination of the complexity is dependent on the application and final operation specifications of the system the complexity of the control and sensing section may also be determined by the choice of activation mechanism and the operational requirements for control such as those discussed more fully herein the sleeve section 24 central shaft 54 and the drill collar 11 may preferably be united by a flexible shaft 33 alternate devices for uniting these components may also be used this enables the axis of the rotating drill collar 11 and the rotating central shaft 54 to move independently as desired the flexible shaft 33 extends from the rotating drill collar 11 to the non rotating sleeve 24 to improve control the non rotating sleeve section 24 includes a sleeve body 51 with a number of straight blades 52 bearing sections 25 26 27 28 and pads 41 the non rotating sleeve section 24 rests on bearing sections 25 26 27 28 of the tool 17 and allows axial forces to be transmitted through the non rotating sleeve section 24 to the rotating central shaft 54 while the non rotating sleeve slides within the wellbore as the tool advances or retracts the valve section 23 operates as an activation mechanism for independent control of the pads 41 the mechanism is comprised of a valve system 43 a radial face seal assembly not shown an.