FujiFilm WP-FZX100 Owner's Manual page 54

2
Remove old grease and foreign particles such as fibers and
sand from the O-ring.
3
Pick up the O-ring with your fingers and feel it carefully, exerting
only light pressure, all along it to check whether or not there are
any dents or flaws caused by foreign particles or cracks due to
deterioration (you can feel these with the tip of the finger).
Examples of foreign particles and damage
Hair
4
Remove all foreign particles from the O-ring groove using a
toothbrush or cotton swab.
Lint Sand Dents caused by
EN-22
➀
Wipe foreign particles off with a
soft, lint-free piece of cloth.
➁
Dry the rinsed O-ring without
wiping water again. This is to
prevent fiber attachment.
When pressing with your fingers
and sliding them over the O-ring, be
careful not to stretch it by pulling too
tight.
foreign particles
Make completely sure that no waste
lint from the cotton swab is left behind.
Flaw Crack