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The spring-back is the small extra push that is needed for the flight deck control to hit its mechanical stop. 

## Push Rods (Control Rods) 

Push rods are used as links in the flight control system to give push-pull motion. They may be adjusted at one or both 

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 . 

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