JVC WR-MG100 Maintenance Manual page 4

● Apply silicone grease on the O-ring
The O-ring needs to be re-greased when its surface appears dry.
Be sure to remove the O-ring and apply the silicone grease on it.
A Squeeze about 1 cm onto your finger
B Apply it on the O-ring by holding the O-ring with your fingers.
If the amount applied is not enough, repeat the above step.
Make sure that you do not apply too much grease!
Dirt and dust will easily adhere if too much grease is applied.
Neither will it improve the waterproofing. Be sure to apply moderately.
Do not pull too strongly!
This will cause deformation.
● Check for any foreign matter in the O-ring groove
Inspect thoroughly as it is usually not visible.
Grains of sand and crystallize salt may be stuck inside.
Remove them carefully by either using an air spray or a swab.
Make sure the fibers of the swab are not adhered.
4
About 1 cm
Grease
Swab
Groove
O-ring