Lost TG-1 lens ring - camera still waterproof?

That's actually a silly design, that the ring opens like a bayonet mount without a lock button. I'll recommend a family member to glue that ring, since he isn't going to add any filter or lens converter.

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Ludwig Wittgenstein; British philosopher born in Austria; a major influence on logic and logical positivism (1889-1951):

“What can be said at all can be said clearly; and whereof one cannot speak thereof one must be silent”