Audi and Volkswagen products uses a single long bolt in an aluminium housing to secure the 2 upper balljoints. Many have had problem getting them out. Drilling them only leads to damaged aluminium housing.
This is how I get them out. A tool also exist to air hammer the bits out, but that tool wont help you on older style Audi A8 and Bentleys and Phaetons, so tread lightly, grasshopper.

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