I have seen in another post the original stud is welded (?). Someone hammered it out, but hammering might induced any bending in the surrounding area...
Hey do you mind providing details on how you fixed it?
* Did you progressively drilled it out ?
* What size of drill did you use?
* Can't the stud be hammered out?
* Type of bolt , how you mounted it / hold it underneath.
* What will happen if you remove the nut , will it drop ? How does it hold...