By "pulling the chimney off" I'm guessing you are using a kanger tank. If so, they are really easy to rebuild and work/taste much better when rebuilt. I started with rebuilding kanger coils, it's really not hard. Items needed: straight edge nail clippers, 30g. Kanthal, drill bit that's small enough to fit inside the notches of the base (pretty sure mines a 1/16), and some cotton balls either regular or organic which ever you can get your hands on or prefer, and a butane lighter, and a pair of tweezers. There are lots of YouTube videos that you can watch that will help with the steps. Couple of try's and you'll have it down and be Dan glad you did. It save a good bit of money and like I said it tastes and works a lot better, and if your into tinkering its and slippery slope until your building RDA's lol. Do be careful dry burning kanger coils, if they get too hot it will melt the rubber insulator and taste like burnt plastic. Good luck, and I hope this helps.