There are twelve bolts on the center section that are inserted when the gear weldment (for a 7A) is installed. I was originally building a 7A, so I had not installed those bolts. Well, those bolts are/can be installed as you are building the center section with a 7. I was worried about getting the washers and nuts on the lower six bolts, but the washers were easy. Next is the nuts and the torque wrench. Once those bolts are in I will be ready to slide the wings on.