How do you glue these back on?

Being that its melting the plastic, the pieces have to fit tight. A broken off stud needs to be glued back in the spot it was removed from. This way it fits tight, also you need to let it dry overnight. This method will make the stud at least as strong as original. You can add JB weld around it to beef it up and make it stronger. I have glued cracked A pillar covers, 69 cuda grille surrounds etc with this method. I absolutely hate getting cracked parts to repair that people have previously tried to super glue. That is the wrong way to go. It adds a film to the part that wont allow the MEK to work and melt the plastic back together.