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A spring housing 63, at the rear of the main housing 10, encloses a spiral spring which acts to bias the housing 36 and 5h bar 34 forwardly. The tension of spring 70 is adjustable by means of bolt 72 which engages complementary internal threads of the aperture in spring housing 68 and spring follower 74. A nut and lock nut of the conventional type are provided to hold the bolt and thereby the spring in adjusted positions. When a launching force is applied to the aircraft, however, the force, exerted through the aircraft on democracy lesson plans 5th grade hook, causes the main housing 19 and its associated parts to rotate counterclockwise democracy lesson plans 5th grade about pivot point 65.