Having decided to change spark plugs and finally deciding they must be under that panel thing on top of the engine, I'm now confronted with a new problem. The little screws that hold on those wire connectors on three of the plugs have been stripped. I was able to get one out, but the other two seem hopeless stuck. Do I have to drill them out and if so, what are the little screw things called so I can get new ones? Are they really necessary or can I drill them out and replace them with generic screws just to hold the connector in place?