I have to say that I cannot see that there is any mechanical advantage of "bolt into" rather than "bolt through". In fact, the opposite would seem to be the case and I am sure that, as Jim says, there are real issues with the former. It just seems to me that through bolting is more secure as long as correct tensile strength extended bolts are used. I have 15mm hub centric pacers on 18" Avus and use extended bolts but even if they were 20mm i would use extended bolts.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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