Received a new -P4 hinge for the flap. Cut one side of the hinge to match the length of the existing -P3 hinge. Used a Dremel tool to cut off the two center hinge eyes to allow future installation of hinge pins. Filed and sanded the hinge. Attached the hinge halves in preparation for clamping to the wing. Marked the new flap brace for trimming in accordance with the plans. Noted that the new flap brace is not pre-drilled on the skin side, so I'll have to drill it to match the existing skin holes.