First day I mounted my 300mm lens on the front of my Century view. I composed a picture near a pond and as I tilted the camera forward, indeed the lens board popped out and the 300mm lens and Copal 3 went in the water. The Copal 3 releases 3 bubbles when submerged.

A race back to my workshop saved the lens and shutter. I had to completely disassemble both front and rear cells to remove all the moisture. That was a harder than opening the shutter, which did not need a complete disassembly. 15 years later the lens and shutter are still working flawlessly.