Next I marked the spot to drill each whole, spaced equally around the inspection panel. I ordered some platenuts, stainless screws, tinnerman washers and some platenut cherry rivets. Maintained edge distance and checked the inside lip for edge distance before I drilled with my caliper. Drilled through the access cover first, then placed it in place, secured it tightly with tape and match drilled into the lip of the wingtip. * the aluminum strips are not installed yet. Next I removed the cover plate and set the aluminum reinforcements in place, held securely with cleco clamps. Drilled into the strips, removed, deburred, scuffed and primed one side since I scratched the heck out of it while cutting them on the bandsaw. Ready to install everything now….