Step One: Use solid or hollow door, center Figure A.
Step Two: After centering Figure A, Pre-drill screw hole.
Step Three: Screw in #6 Figure C fine thread screws into place
Step Four: All screws Figure C are to be are made to be countersunk, for smooth glide fit.
Step Five: Figure A should be flush with the end of the door’s edge exposed to door jam.  There should be at least 1/4″ overhang on the end that goes in contact with Figure B.