Ah, good spot. Right, need a little mirror to see it. Cheers @Aroogah, will check back in with the result.
It will almost certainly be a small allen key fitting. Do not lose the screw, I speak from bitter experience.
@crossedthread started
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Ah, good spot. Right, need a little mirror to see it. Cheers @Aroogah, will check back in with the result.