Before you start drilling take a punch as close to the size of the stud, and smack it as Hard as you dare without messing up the cases, To jar the threads. Drill in the center of stud (CENTER) And work your way up to the largest easy out size brill bit for that stud. drilling in the center (CENTER) each time. At this point you have a couple options: 1- Try the easy out, do not break it (DONOT) 2- Let it soak with penetrating oil, Then see step one 3- Get Some freon and spray inside the hole to shrink the stud, then see step one 4- If step 1-3 didn't work, continue to drill all the way to the bit, that is called for, for that size stud tap, Continue to step 5 5- Use a good hardened pick to spiral out what's left of the stud ( This will work a lot better if you drilled in the center... Very important? If you did good All you have to do is catch the beginning of the coil bend it out a little bit grab it with needle nose and pull. Chase the threads 6- Continue to drill to proper size for heliocoil for that size stud, And insert heliocoil. 7- your fuqed buy new cases Sent from my SM-A505U using Tapatalk