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Having to use/buy threadlocking agent.
Tooling spaces being smaller and easier to round than the larger head on a screw/bolt.
Being cackhanded and screwing so far that the bolt drops into the internal space of the frame.
Not applying enough threadlocker, or it deteriorating over time and falling into the frame
I bet there are more.
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Being cackhanded and screwing so far that the bolt drops into the internal space of the frame
Drop some superglue into the frame through the hole. Allow the lost screw to find the glue and settle in it until it sets. I did this with the pinhead from a pop-rivet, albeit in a c/f frame. Never heard any more from it.
What would those be?