The output voltage adjustment can be manual or automatic. The PSO-1 has neither a focus adjustment nor a parallax compensation control. It has hydraulic values that include automatic adjustment. Because of the additional resonant circuit, one manual and one adaptive tuning adjustment are necessary. The front forks are air assisted with rebound damping adjustment. Multiple dynamic equilibrium adjustment and regulation mechanisms make homeostasis possible. Situated on the left spine are the volume adjustment controls. The seam can be reduced by a simple gain adjustment. The second row features three individual seats with recline adjustment. On engines with mechanical valve adjustment, excessive clearance causes noise from the valve train. Alternatively, users can opt for an "automatic" adjustment of color and contrast. Citizens displaced by the resulting border adjustment were given land elsewhere as compensation. These are normally attached to a length of elastic allowing for adjustment. Some clocks have a timing adjustment (a fast-slow control). This social constructionist theory thus allows for a needful evolutionary adjustment.