These studs don’t have the Etorx head that some have. Or is there some specialty tool that grabs the stud somehow? My knipex cobras were able to grab to non threaded part on the more stubborn ones.Probably too late for you, but there are special sockets for removing studs. I have a set and they are amazing, work really well.
A quick google shows there are a plethora of stud removal tools of different designs. Guess I’ll be doing some research now.
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