Although there is reference to two cables, the cables actually formed a single loop terminating at each pilot's control yoke. The description of tension in the control cable is with reference to each of the flight yokes. It is this tension that allows movement to be mirrored between the yokes and forces to be distributed to either aileron. Breaking the loop removes aileron control from both yokes. This was a serious design flaw. In hindsight it seems obvious that this single point of failure would be catastrophic, however the cable was over engineered for the anticipated forces it might be expected to experience.
A further section in the report clearly states that in the absence of a safety wire, the turnbuckle fastening would and was demonstrated to unthread in the presence of vibration.