Thanks, Frank! I will try that trick this week and see. I did some research and it looks like it's "fairly" simple to pull the head off, right? (I'm a shade tree mechanic, so I'm fairly comfortable).
Yes, the plug has a decent amount of oil on it. Actually, now that you mention it, it was running a bit rough last fall and I changed plugs. It had some oil on it then too. Is that a sign of a bad gasket too?