good question. It DOES come out, I promise.
firstly, take the 510 screw out of the bottom.
then, take the post screw out of the middle post.
Now, with something thin and small, but still sturdy and rigid (like a small flat head screwdriver or a small allen wrench) insert it into the post hole (like a coil) and twist it while pulling upward.
The goal of this is to twist the center post up and out of it's position.
It's best to do this while its connected to a
mod THAT IS TURNED OFF.