Operator is correct regarding the fact that the proper installation of any bottom bracket with flanges, cups, bearing cartridges, etc., that tighten against the faces of the frame's bottom bracket shell requires the bottom bracket to be faced (By a mechanic skilled in the use of a bottom bracket facing tool). However in my experience, eyeballing the shell will not suffice - checking the shell requires that the tool be installed and the cutters lightly rotated on both faces.