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Why You Should Install a Hook Lock Hook locks will stop thieves from stealing the contents of your van by securing to the door of your vehicle. They also decrease the risk of workplace injuries caused by spring latches that fail on slinghooks that are standard and fail to close when not under load. This paper uses numerical continuation and bifurcation theories to study the motion properties of the hook lock mechanism. To maximize the force for unlocking, the impact of the weight of the landing gear and the spring's locking pa