Loose nuts that attach the lenses to the clip. One fell off almost as soon as I put it on and I couldn't find the little nut. For a while I was still able to use them and tried to tighten the other nut on the other side, but this is difficult as the fat head is rounded. In the end I managed to lose the other nut that kept unscrewing and now they are useless except for the right eye only monocle.
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