[Blackbirdws6]

I twisted the studs that came with the s60 rear using conical lugs and did it again even when I upgraded to 1/2 studs. I've never had an issue with shanks so far but the latest ARP studs seem to be doing the job.

I have a pack of what they call extended conical lugs which folks have said work better than their standard counterpart. Essentially there is an extended shank like nose on the lug going towards the wheel hub. Billet Specialities makes them.