• Thanks plexarice, that's a great lead. I will check them out.

    Louis, if you do find something that works then please let me know. I have just measured the thread with a calliper and it is M4.

    So total length of screw is 8mm (thread section is roughly 5mm) and diameter of thread is 4mm.

    Would be keen to get a few of these so I have a few spares.

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