The support has a runner (14), and a cap integrated with hydraulic plungers (15). The cap (16) is divided longitudinally and each partial cap (20) has a plunger stored on the runner allowing free movement. The plunger is linked to the caps allowing vertical movement (KE) between the partial caps in a side direction. Each partial cap is connected behind the plungers with a steering setup (17) for the runners.
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