For anyone else in the future looking for information on this and reading these posts: The jury is still out on if there is a problem with the part, and if re-tapping the bolt is advisable. It turns out I have ruined two bushings by screwing the bolt too far in (which could not have happened had I not re-tapped the nut). So maybe these are indeed intended to be stop nuts that by design do not allow the bolt to go all the way through. The issue is still being looked into...

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Henry Bofinger
1989 560 SEL (black/black)
2001 Audi TT Roadster (silver/grey)