When you drop your Marvelight 3ft onto a tile floor.
There's a small dent on the side of the watch on the edge of the bezel and case. I had synced it up with the USNO master clock the night before. It had skipped 3-4 sec right after the drop. Previously was running about 0.5 sec a day fast. Since last night is now -4 seconds in 12 hours.
The rotor seems to be making a bit more noise too but that might be my imagination. Everything looked fine when I opened it up last night.
BTW, does anyone know what size o-ring the watch uses? I have an account with an industrial supplier of like 10 bazillion orings.