I've had one of those caps come loose on the edge of the front passenger door. Just pushing/forcing it back in place didn't hold for too long, so I superglued it carefully back in place. Doesn't move now!
. Either me or the first owner must have caught it when opening/closing the door. And yes, you are paranoid. It's quite normal.
Now if your door fell off, that would be a problem....seriously though I know exactly what you mean.
The inner 'lugs' in the cap ends don't seem to hold the cap in that tightly IMO.
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