A hinge or bearing supports the axle, allowing rotation. The tail rotor has only a teetering hinge. They have also appeared on TV in concert with Hinge and Bracket. Boeing designed a hydraulically damped toilet seat cover hinge that closes slowly. A reinforced hinge was required to implement this design. They comprise two parts, linked together by a chain, a hinge, or rigid bar. Finally there is the spring hinge (self closing door hinge). Hydrocarbons are trapped in the hinge of this fold. It is a large hollow green castle, consisting of two halves connected by a hinge. Similar folds tend to display thinning of the limbs and thickening of the hinge zone. Dampers are usually used to prevent excess back and forth movement around the drag hinge. The video cable is routed around the left-side hinge. Examples include "door-hinge", "torn hinge", "or inch", and "a wrench". The deck unseated at the hinge and failed in shear. They allow the points to hinge easily between their positions.