I used an special socket for rounded bolts on mine, just tapped it on and then took the stupid things off and replaced them with standard lugs. Pointless and annoying if you ask me.
I would not try to drill them out though, lots of opportunity for disaster going that route.
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2001 Boxster S 3.6L, Zeintop
"Calling upon my years of experience, I froze at the controls." - Stirling Moss
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