Good Afternoon,
Since it's above 40 degrees fahrenheit, I decided to check the back sides of the rotors on one of my BMWs. On the passenger side, the inside facets of he allen bolt are rounded enough so the bolt won't unscrew. Do I go for the drill and drill it out and then hope to grab the remainder with a vice grips once the rotor is off or do I tack weld a bolt on and anticipate I will be able to remove it with a socket. I've drilled them off before but as I recall, it was a wonderful warm Spring day and it took a bit of effort to drill it off. Anyone been there done that lately? I need to get the rotors turned as part of a brake job.

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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,