Drilling out broke Glow Plugs
http://alan.mcreynolds.googlepages.com/howtoremovebrokenglowplugs-mercedesom606

Another drill out thread but different
http://www.peachparts.com/Wikka/OM606BrokenGlowPlug

Another drill out thread- check and see if it is the same as the 1st one
http://www.peachparts.com/Wikka/BrokenGlowPlug

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84 300D, 82 Volvo 244Gl Diesel