I am in a quandry and am looking for ideas. I am replacing the spark plugs on my 98 100 series and have encountered a problem with just one of the plugs. I replaced all the plugs 107K miles ago so I decided it was time. Here is the problem. I cannot get any of my plug sockets to engage or lock onto the plug. It is the 3rd plug from the front on the driver's side which makes it very difficult to see. I thought something had fallen in and have stuck a stiff wire into the hole hoping to detect something inside and I even put the vacuum cleaner hose over the hole. Nothing has worked so far. My next move is to get some dental tools and a dental mirror hoping to see inside more clearly. Has anyone encountered this problem or have any ideas on what is going on.