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I do not believe anyone makes this but what is needed is a Pilot Drill with the Pilot end the same size as the drilled passage that goes through the center of the Glow Plug Body and has an outside diameter that is smaller than the inside diameter of the threads for the Glow Plugs in the Cylinder Head.
The Pilot on the Drill Bit would keep it centered and you only need to drill a little past where the Glow Plug Threads would be.
After that you could follow the Wikki or the DIY to finish removing them.
Below is a pic of one type of Pilot Drill. There is also a type where the Pilot end is smooth so it does not cutting but the end guides it through an existing hole.
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84 300D, 82 Volvo 244Gl Diesel
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