I've got several industrial sewing machines mounted on leveling feet to deal with my uneven floors. But I've found the vibrations of the machines are enough to loosen the nylon-insert lock nuts attaching the feet to the table legs. While poking around for a better solution, I came across this Nord-Lock Washer design:

It's a clever exploitation of wedges, and is of course completely reversible. The idea isn't new; the company has been making these for some 30 years. 24mm Zinc Threaded Bar

Nord-Lock's newer X-Series of washers feature serrations on both sides, allowing them to bite into the underside of the bolt head:

While the washers are removable for the sake of performing maintenance on whatever you're bolting together, the end user has to make the call on whether they're reusable or not:

They're also not quite idiot-proof in that one must ensure the washers are laid down in the correct orientation. But overall I think it's a pretty sound design.

https://www.youtube.com/watch?v=IKwWu2w1gGk This clip really shows the effectiveness of this innovation.. Its pretty wild to see how it compares to the competition.

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