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Made this, gave it a 'dead' battery and its been going for almost a week
I have used bike spokes, you smash them with a hammer on an anvil, also metal inside used wiper blades is great
I have had a few tubes lose the valve out of them, I wonder if this would work to put it back in
EDC Flashlight Bite Guard
The Arduino Synthesizer
I have a pick cutter. I love it. Lots of things you can make them from. Try a peanutbutter plastic jar. Curved to fit your thumb, bends in one direction, plucks hard in the other.
Very cool. I have used bike tire inner tube for a road bike doubled over about 3 times.