tailcap button question

You just unscrew the retaining ring with a ballpoint pen or needlenose pliers, then pull out the switch guts, then there's your switch boot, ripe for the replacin'.

Repeat the process in reverse to complete.
 
Usually the tailcap has a retaining ring, either metal or plastic, with one or two holes in it. Place something in those holes, overall, pliers seem to work best, and unscrew the retaining ring. Then push the parts out(push from the outside) and do what you need. Then go backwards to install everything back again.
 
is it pretty much the same for replacing the o-ring of the flashlight head(where the cree bulb is)?
 
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