If there is still a little bit of a stud sticking out, you may also be able to take a dremel with a cut off wheel and cut a notch in it and try to us a flat head screw driver and get it out. Learnt that the hard way with a front shock bolt once.

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1978 240D Auomatic
Custom Charcoal Gray, Navy MB tex, kenwood/Elemental/Boston/Aura sound,
Shaved antenna and emblems.

1990 Lincoln Town Car, Sleeper/Strip car in progress, 17.75@77mph.