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Why You Should Install a Hook Lock A hook lock will prevent thieves from stealing the contents of your van by securing it to the vehicle door. They also reduce the likelihood of accidents on the job site caused by defective spring latches on standard sling hooks that do not snap shut when not in use. This paper uses bifurcation and numerical continuation theories to analyze the motion properties of the mechanism for hook locks. The effects on the landing gear's weight and locking spring parameters are st