Soak the area with penetrate and let sit 24-48 hrs. before doing anything. Patience is key. Wiggle burner in all directions. I find it helpful to do this in a quiet environment as you can sometimes hear the pieces start to break free before you can see it. Some folks, myself included,
use the heat and quench method but, I save this for the last resort. If you can't post a picture (image host required) you can e-mail me and I can post. Good luck and keep us informed.