Remove the silicon cup on top, get a pair of pliers and leaving the head screwed into the base pull that vertically grooved pin off (it`s a very tight push fit!).
Remove the strands on top of the coils (these are called the flavour wicks and are basically seperate sections of silica)
You will see the coils with the wick threaded through.
Now you can wash this under some hot running water first if you like, then pulse your battery while gently blowing on the coils, they will glow and fume, keep going until the silica wick turns white (and I mean clean white! not white hot

)
Replace as many of the flavour wicks as you like (and now is a good time to make sure you have some spare silica wick around!) some people like 3 strands for PG biased juice, some people like less (or none) for heavy VG juice.
Replace the center pin and silicon cup (I usually put the cup on upside down as it allows more juice to get to the wicks).
Fill and vape
Now if you want to do a half rebuild a good method is......
Strip the wicks out of the coil completely leaving the coil in place.
Flash the coil while blowing on it until nice a clean.
Grab some 1.5-2mm silca (size depends on the diameter of the coil as I make my own about 2.5mm dia) and double the silica over a thin strand of cotton.
Thread the cotton through the coils and gently pull the new wick through.
Check you hav`nt disturbed the coils and if you have just tease them back into place with a pointy thing

Check resistance (to make sure you hav`nt created a short!)
Pop the pin back in and trim the wick with nail clippers, replace silicon cup (upside down)
Fill and vape.
The next step it to completely re-coil and re-wick the heads (which is what I do) but for that you will need Kanthal wire and some basic tools.
It`s not exactly hard but definately not something for a complete beginner (and I apologise in advance if that sounds patronising! but it has more potential for shorts and possible battery damage if it`s done wrong), plus re-wicking is all you really need if the coils are good once cleaned
