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  • I used an M6 nut with a countersunk allen head bolt. Both bought from a local hardware store for pennies. They also sold the threaded rod for a few pounds.

    I used a metal file to make a sawtooth edge to the bottom of the shaft to help it bite into the plastic and also drilled the hole in the underside of the head 0.5mm too small with the idea that the bolt would make a thread in it too.

    The bolt is short enough that I could also put a screw through the shaft as I wasn't convinced the head wouldn't rotate but even in a totally mangled state, so far it hasn't budged.

    I'm not sure who came up with the idea but it's pretty great.

    This is what I have started using, no problems so far!

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