zsoumyahi these are for when the ones on the light are worn or so . keep an eye on them every so often...
the one in the lens are probably never needs replacing unless like the lens in damaged etc..
replace the O rings every 1 or 2 years to keep the light waterproofed resistant etc.
keep the threads lubed with good thread lube.
i use nano oil.
nothing to worry so much.
replace the O rings every 1 or 2 years to keep the light waterproofed resistant etc. keep the threads lubed with good thread lube. i use nano oil.
nothing to worry so much.