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Dammit's talking about the tapers rather than the thread I think. Makes sense, make sure you mask everything not visible from the outside.
Correct - also make sure you have the correct type of taper, when I was up at Centre Gravity they buzzed the wheel bolts out of a very expensive set of Fuchs' on a 997 that had just turned up, to see that they were all conical. Porsche wheels use hemispherical mounting surfaces, so with the conical bolts only a tiny area was actually in contact.
That chap had the local Porsche centre deliver 20 new wheel-bolts that day, with the conical ones all going straight in the bin.
Dammit's talking about the tapers rather than the thread I think. Makes sense, make sure you mask everything not visible from the outside.