There is no steel track. The roof crown moulding is all one piece of extruded aluminum and it is a bi-fold moulding. When new the top part of the moulding was open, exposing the bottom piece of the moulding with all of the nail holes. The moulding was installed on the car in the open position and nailed in place via the holes that were drilled in the bottom piece of the moulding. After the moulding was installed at the factory, then the top piece (which is round) was bent over on the bottom piece thus hiding the nails and most of the bottom of the moulding.
The moulding cannot be reopened without destroying the moulding. Therefore, you carefully pry up the entire moulding, which in many cases is easy because of the wood rot. Once the moulding is removed, then the exposed nail shanks are cut off flush with the bottom of the moulding.
For re-installation, small countersunk holes can be drilled in the top center of the moulding about every six inches, and the moulding is then installed with flat head countersunk screws. After the moulding is installed, the holes are filled in with Bondo and the moulding is then painted.
