Question for METE SF (or other METE)owners, what are the 2 thinner screws that are in the little pistol tool supposed to fit, the small one's for the mag well, the thicker screws for the optic plate (I assume) and then there are thinner screws (or vise versa) I only see the short screw and then 2 others for the optic plate in the manual so I am confused TIA