For anyone interested here is a brief description of how I did it and avoided the M shape on the ground using tools I already had. No center punch needed.
First I ground down some feeler gauges so they would fit in the plug.


Then place the plug in a vice and insert the feeler gauge (stacking if needed) to the desired gap.


Now tap gently and evenly with a hammer. Slide the feeler gauges back and forth between each tap with the hammer to determine how much force should be used on the next tap. The feeler gauges will act as a shim to prevent you from going to far and thus preventing you from prying on the plug to try and regap it after you have gone to far.


The end result is a straight ground without the M shape that comes about when using the center punch method. Don't forget the anti-seize!!!!

 

Great tip! My new plugs have been sitting on my bench for over a year now...I need to get around to installing them!

 

excellent tip. just remember, this tip is for the motorcraft spark plugs.

the design in the champions are different, you can gap those with the usual procedures