Those nutserts are a royal pain in the butt. If I had to guess the only issue was probably that the nutsert was not fully seated.
You can buy replacement nutserts at a BMW dealer. What I did was to use AKG nutserts that are ribbed on the exterior. They grab and hold much better than the BMW nutserts that are flat on the outside. Even then, I still had issues..
Ended up I had to have one of the nutserts tack welded into place to keep it from slipping so that you could expand it in place and have it hold... |