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I see you posted this yesterday and you're probably done, but I hope you put some anti-seize paste on the threads before you installed the new plugs. It'll save you some trouble the next time you do a change.
I use a copper antiseize (though with a little nervousness - Al-Cu interactions and all that; in house wiring, you try not to put aluminum and copper together, to avoid electrolytic corrosion). I'll watch this thread and see if anyone has a better suggestion. I figured conductance was a good property to encourage with spark plugs, and I definitely wanted to get them back out again.