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The ship’s center beam broke and caused leaks until it was pushed back into place by a huge jackscrew that passengers had brought from Holland.—Literary Hub, 12 June 2026 The landing gear was extended and measurement of the left and right wing flap jackscrews corresponded to a flaps retracted setting.—BostonGlobe.com, 16 Oct. 2019 The item, called a jackscrew, is used to raise or lower the angle of the horizontal part of the plane’s tail.—Washington Post, 27 Sep. 2019