There was nothing there to grab ahold of. The only real option was to drill it out. If it wasn't an iron plug I would have drilled it back out to 3/4" but since I would have to then again add an adapter I chose to drill out the cast piece after cutting it flush. Then texturing the area so it looked original. I realize this isn't really preservation but this isn't original to the car (water pump) so I felt it was fine.
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