The middle hole was the biggest pain in the butt to drill out. There was a 1/4" thick piece of metal (maybe titanium) that I had to get through. I ended up breaking 6 drill bits getting through and it took a few hours over two different days.
I tried using the tap for the M6 helicoils, but the metal portion wouldn't take easily.
I'll be away from these projects I've been working on for a few days. When I get back to it, I'll drill out the holes a little larger, fill the holes with epoxy and milled fibers (since I have a few pukas to fill around the fuselage anyways), drill new holes and then tap through the epoxy instead of the carbon and metal. Should make for a nicer end product.
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