Drilled out rivets to remove lower hinge, cowling side. Due to not securing the lower cowl to the prop hub fixture while laying out the hinge, the lower cowl was shifted 1/8 to 1/4" binding the hinge and moving the prop hub center.
Drilling out rivets in fiberglass can be difficult, with heat building quickly from the drill, loosening the rivet fit and spinning the head. Used a Dremel cutoff wheel to cut the backs of the rivets. Held the rivets with pliers while drilling out the heads. Several ways to remove rivets.