A buddy of mine showed me a great tip--using a funnel with long extension, run a dab of gasoline down in the hole--best thread loosener I've ever seen! Just don't get too exuberant with it, and obviously, don't do it when the engine's hot (LOL).
Isn't that one of those spots that longer is better? I'm thinking I used a really long extension, with either a wobble end or swivel (it's been a while since I had to pull mine)--gets your hand up out of all the crap in the way.