Re: Quick-and-dirty testgear: mains voltage monitor.
I really want something to sit on a shelf. And not rotate.
Building it into a 13A plug would mean it stuck out a good couple of inches, and in my 'office' (where I intend it to live) means it would be concealed under dark recesses of the bench where the power-outlets live.
If I wanted a circular encasement I'd use a section of round plastic drainpipe: at least I could then use a couple of easily available and same-coloured wall-mounting brackets to keep it stable.
Another possibility: an offcut of steel scaffold-pole. Heavy, so better able to resist the weight of the cable. But it would still require engineering something to stop it rotating on its long-axis.
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