an apparatus and a method to control rotational positioning of continuous concentric tubing that extends from a surface downhole in a subterranean well or bore . in one version , a continuous cylindrical inner tube resides within and is concentric with a cylindrical outer tube . at least one elliptical lobe extends from the continuous inner tube . the invention utilizes diameter restrictions within and attached to the outer concentric tubing so that the elliptical lobe or lobes engage the diameter restrictions . accordingly , rotation of one tube rotates or orients the other tube .