FujiFilm WP-FXF500 Owner's Manual page 55

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
EN-23
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.
Dents caused by
foreign particles
Make completely sure that no waste lint
from the cotton swab is left behind.
Flaw Crack