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Why You Should Install a Hook Lock A hook lock prevents thieves from stealing your van's contents by latching onto the door of your vehicle. They also decrease the risk of workplace injuries caused by spring latches that fail on standard slinghooks and fail to snap closed when not under load. This paper employs numerical continuation and bifurcation theory to analyze the motion characteristics of a particular kind of hook lock mechanism. The effects of the landing gear weight and the spring's locking p