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In the last post I had cut the fuselage skin openings for the fresh air vents.  Some people have attached these with just RTV but I want them riveted in. Since the vents are plastic I also wanted to make a backing plate for the rivets.  I could have just made small strips with a hole in each one but making a single doubler for each was not real hard.

These pictures show the sequence. I used the nibbler on the inside to get close and then snips to cut the outside. Filed them to fit and they are ready to install.