I just changed my spark plugs and O-rings this past weekend. The first few tubes were difficult to get out, but the last three were a breeze. I used a very specialized, intricate, expensive tool to remove the tubes...
...a piece of coathanger with one end bent back 1/4" to grab the edge of the tube, and the other end of the coathanger bent into a "handle" with a rag wrapped around it for a better grip. Worked like a charm!
