Fabbed a small flange for the bottom of the left wingtip rib for support where I removed material that interfered with the lower hinge. Drilled, deburred and match drilled flange to the left wingtip. Trimmed the wingtip at the leading edge to aid in installation. Countersunk the new holes drilled in the wingtip for AN426 rivets. Marked and drilled hole in plastic anchor block for bottom pin in left wingtip.