Well, all is right with the world (okay, MY world).
I got my Extra out after work today and got in three good flights with my newly-rebuilt DL. Started right up and purred like a kitten - on the ground. In the air it's running perfectly and roars like a tiger (is that gay?)

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I ran it without that aforementioned spark plug cap spring too. Won't make a habit of it I guess and will replace it next time I take the cowl off, but didn't have any problems without it.
All I have to do tonight is cook some brats for my wife and step-daughter and look at my airplanes!