The lock washer is a contentious thing. Engineers tend to have their favorites and nothing else will do. Whether it is a split lock, conical, internal/external tooth, or maybe a nut with nylon insert, thread-locking compound, etc, there seems to be an endless list of mechanisms for securing fasteners. The ultimate goal is to prevent a fastener from loosening which can end in a catastrophic failure.
No matter which of these locking options you feel is best, this video from Nord-Lock will most likely cause you to pause and reconsider your die-hard stance.
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