After marking and cutting and filing once more, you can see the wire butts tightly and this cylinder is completed. The process will be repeated seven more times. Once done, the heads are installed sans gaskets and tightened to 25 ft-lbs in proper sequence to seat the wire. Then the heads are removed to check the O-rings. This is done to ensure that the wire didn't buckle once seated (wire too long) or that the butted ends didn't separate once seated (wire too short).