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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 reduce the risk of work-site accidents caused by faulty spring latches on standard sling hooks that fail to close when not under load. This paper uses bifurcation and numerical continuation theories to analyze the motion properties of the hook lock mechanism. The effects on the landing gear's weight and the locking spring parameters are examined in depth to maximize the force of unlocking of the ho