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Why You Should Install a Hook Lock Hook locks will stop thieves from taking the contents of your van by securing it to the door of your vehicle. They also reduce the risk of work-site injuries caused by spring latches that fail on slinghooks that are standard and do not snap shut when not in use. This paper employs numerical continuation and bifurcation theories to study the motion characteristics of the mechanism for hook locks. To maximize the force for unlocking the impact of the weight of the lan