I had exact same problem - re-tapped but used a high tensile bolt (allen key type) tighten bolt hard then tapped around area with small hammer, nipped it up a bit harder the did the same -

Took hours but came out eventually

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David


1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)