A linear motion cable drive including a plurality of drive assemblies each including a drive cable helically wrapped around the driven cable with means to rotate the drive assemblies about the axis of the driven cable to negate the rotational effects of the helical wrapping. Apparatus is provided to permit discontinuities in the form of larger or smaller cable portions to be fed by the drive unit without causing rotation or twisting. The same helical wrapping can be used in an overlapped, reverse wrap configuration to form a cable locking device.