Those look an awful lot like one of the heads I got with a Totally Wicked tank; bottom dual coil (BDC), right? I know TW sells TECC stuff, so that's a clue.
Anyway, I had limited success by looking at Rip Trippers' video on rebuilding Aspire BDC heads. They're really a pain because they have this thin strip of cotton where the two pieces press together; it was not fun getting it back in. Also it takes a lot of patience to set up those dual coils.
Anyway, to get mine apart, I had to use two pairs of pliers - one on base, and one on the chimney. Wiggle the chimney one and it should come loose.
Don't take the bottom pin out if you want to keep the stock coils alive; I mangled the coils by dismantling too much. You can take the chimney apart to expose the coils without ruining anything.