code: def mount_points(self):
          " return mount points"
          wp = cq.Workplane("XY")
          h = wp.rect(self.hole_spacing,self.hole_spacing
                      ,forConstruction=True).vertices()
          return h.objectf mount_points(self):
          " return mount points"
          wp = cq.Workplane("XY")
          h = wp.rect(self.hole_spacing,self.hole_spacing
                      ,forConstruction=True).vertices()
          return h.objects
docs: return mount points