Clinically a 2 mm pilot drill is placed as mesially as possible, but X-ray does not confirm it (Fig.4 parallel pin in place).  The trajectory is changed as shown by red arrow in Fig.5 (illustration).  The change is minimal, because the bone is soft.

Overcorrection

Xin Wei, DDS, PhD, MS 1st edition 09/12/2015, last revision 01/19/2018