Now you are at the stage where mistakes can happen. Not that any other stage they CAN'T........but anyway. Find a nut and screw that is the same diameter of the rivet you will use to hold the two halves together. Separate the halves and drill your mounting holes IN THE CAP ONLY. Then pick a side to begin. Realign your cap against the face piece but MAKE SURE YOU HAVE THE ENTIRE BROW TRIM FITTING TIGHT AGAINST THE FACE FROM EAR TO EAR. This is the mistake that happens a lot. Once you pull it tight AND have that eye corner/trapezoid alignment confirmed on both sides, mark the face through the hole on one side only! Drill that out and insert your screw and nut and tighten it down. Once that screw is in place, you can be free to mark the other side at will without having to worry about anything moving or slipping out of place. Make sure to pull it tight to the face. Once you are happy, mark/drill the other side. With the screws, the two halves will still be allowed to pivot allowing you to further refine the placement of your brow line. It is STRONGLY recommended to place a rivet further down the line toward the bottom on each side.