Locking-clip Turnbuckle body Figure 2-77.  Clip-type locking device and assembling in turnbuckle. ends.  Figure 2-79  shows the parts of a push rod. Notice that  it consists of a tube with threaded rod ends. An adjustable  antifriction rod end, or rod end clevis, attaches at each end  of the tube. The rod end, or clevis, permits attachment of  the tube to flight control system parts. The checknut, when  tightened, prevents the rod end or clevis from loosening.  They may have adjustments at one or both ends. The rods should be perfectly straight, unless designed to be  otherwise. When installed aspart of a control system, the assembly  should be checked for correct alignment and free movement.  It is possible for control rods fitted with bearings to become  disconnected because of failure of the peening that retains the  ball races in the rod end. This can be avoided by installing  the control rods so that the flange of the rod end is interposed  between the ball race and the anchored end of the attaching  pin or bolt as shown in  Figure 2-80 .  The spring-back is the small extra push that is needed for the  flight deck control to hit its mechanical stop.  Push rods are used as links in the flight control system to  give push-pull motion. They may be adjusted at one or both  Figure 2-78.  Spring-type connector.  Figure 2-79.  Push rod.  Push Rods (Control Rods) Adjustable rod end clevis Tube Adjustable antifriction rod end Rivets Checknut Threaded rod end Spring connector 2-46