Here is my pin. Looks good to me.
Also what's this crap in the hole. I took the center post out and there is something in there that looks like silicone. I pulled out the grommet and everything that is supposed to be in there out. Can't put my post back in cause this is causing friction.
View attachment 280751View attachment 280752
My guess is the center post of the 510 connector in the drip well slipped with the heat and was not making good contact with the atty. If they atty is not shorting from the center pin making contact with the outer wall there is nothing else in the atty to melt. It's threaded metal to metal contacts for both negative and positive posts.
See if you can get the 510 socket back together if not, it might be taking a trip back to it's birth place.