Heli-coil questions

The little tang on the heli coils break away with a tiny punch on most. If you have another heli coil from the set look for a line near the tang. I use pipe dope on exhaust studs rather than rtv but that's me. If you chose to try drilling out a plug make sure its not pipe thread and grab two. One to do a test piece in a vise before you install one in your head.