Another 606 glow plug removal thread

[ROLLGUY]

My friend had a small coolant leak in his '99 E300, and we determined it was a bad head gasket. He had already purchased new glow plugs, and I was ready to install them when the coolant leak started. I pulled the head, and was able to get five of the plugs out effortlessly. Number three was not so easy. I managed to get it out a little more than half way (soaking it overnight with PB Blaster with the head on it's side, glow plug down) before stripping the hex of the plug. I then took it to a friend to have a nut TIG welded on and heat put to the head around the plug, only to have it break off just below the welded nut. I prepared myself to drill it out by searching here and looking at videos. I was not able to find a good way to drill out the center electrode, so I used a center punch to smash it down inside the body of the plug to make a pilot for a drill. Here is a photo. I can only upload one photo, so I will give the play-by-play with each photo.