if your going to use facets as primitive
dont start off with a facet or you will end up with a symmetry problem.
1 start off with the grid primitive
2 set X symmetry on
3 attach the facet to the grid.
to attach the facet to the grid
hold the shift key down put your mouse cursor over one of the grid points
this will snap it to it and a white cross will show up letting you know your over a point
when your done double click to close the facet.
click the image below
