Other thing would be to try a stud extractor or if you can fit one down a bolt remover rather than drilling all the way out and re-tapping?
Stud extractor
Nut / Bolt remover
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1996 A8 4.2 QS. Bose, Solar roof, um...um... rally sport towbar. Now gone to a new home as the Traders 8.
Bright yellow bus o love.
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