There are “OLD” ways and “NEW” ways. Neither is wrong, just different. Not long ago, nobody would have imagined that a roof system would be built on the ground and then raised up and set on the wall system. Bigger equipment and more accuracy make it possible. This is our addition to the new way, a Flying Truss Spacer. Secure spacer on the bottom chord with screws and as you lift the roof system up, these will help align it with the previous section. The Flying arm catches the last truss and guides into place.