Sorry for your troubles. I've learned to ask tire stores to hand torque the wheels and watch to be sure they comply. I had an instance where I couldn't get the bolts loose out on the road. I now carry a breaker bar and 17mm deep socket in the trunk because the Mercedes-supplied wrench just doesn't cut it.

I'm not sure, but I think those studs just press out from the hub, at least that's how it was on other brands I've owned. They are serrated and have an interference fit.

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1981 300TD 310k miles
1970 280sel 172k miles
1966 230 Fintail 162k miles

"Where are we going? And why am I in this hand basket?"