Fig. 2.
(A) Reference lines H, V1 and V2. The center of rotation is marked on the normal side, indicated by an arrow. Reference lines: the first goes along the lower edge of the teardrops (line H); the second is perpendicular to line H and goes along the lateral edge of the teardrop on the normal side (line V1); the third is also perpendicular to line H and goes along the lateral edge of the teardrop on the side to be operated (line V2). (B) Transfer of the CR from the right side (normal) to the left side. Distance a should be equal to a′ and distance b should be equal to b′.