I sanded my cowl ring slightly to fit snuggly inside of the cowl. I placed the cowl's trailing edge down on a flat work surface, & pressed the ring lightly to ensure it lined up perfectly with the edge of the cowl. In the next picture, you see me with the assembly flipped over, tack-gluing the ring to the cowl from the bottom. I applied the thin CA very slowly & carefully, just inside of the edge -- ensuring CA did not run over the edge to the outside of the cowl. Then the inside was glued.