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Like the rear spar, I started to back rivet the doubler plate flush rivets and some of the round head rivets. However I switched to the squeezer when I realized the flanges were not in the way with the round heads on this side.

The last tow pictures show the finishing up of the fixtures for supporting the HS skins while riveting them to the interior framework. Kathy put the duct tape on the pieces for me to protect the skins from getting scratched.