Ricoh WG-M1 Operating Manual page 26

Steps for installing the lens protector:
Slide the lens protector lock in the direction
shown by arrow ① . When three alignment
points are in a straight line, rotate the lens
protector in the direction shown by arrow ② .
until it clicks.
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When the product is exposed to
fluctuations in temperature, condensation
may form on the inside surface of the
lens protector. If this happens, remove
the lens protector, clean it with a soft,
dry, lint-free cloth, and then reinstall in
the lens.
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