flaky or loose USB connector
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USB connectors are too fragile for the constant in-out service they get. But I have solved the "loose USB" problem, at least for standard Type A. The plug end (its steel case slips into the port end's steel case) is functionally female; it accepts the 4-pin tongue of the port and squeezes it between the 4-pin tongue of the plug end and the steel case of the plug end. So when the plastic tongues wear down, the squeeze isn't tight enough. Solution: take a small vise-grips and make the plug's steel case a little thinner, like a weight on a grilled cheese sandwich you're making. Then when you plug it in, it will resist a bit and feel tighter. And it will now work!
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