The Cessna 120-140 Association Forum

I had to replace the left forward door post from the carry-through spar down to the forward gearbox bulkhead. The bottom end of the post has several layers and several of the large rivets around the bolt hole are flush on both sides so the the fork of the bottom end of the wing strut can fit around it.
Attached is a picture of the forward side of the bottom of the post, with most of the rivets removed.

My assumption is that these rivets are something like AN426AD-6 flush rivets that are bucked down so the shop head fills the countersink, then anything that sticks out is shaved or filed off.

Has anyone else replaced these double flush rivets?

Sent you a PM for a contact to help you.

Yes that's what they are. I used a big old mil surplus gun with a helper.
Those layers really suck up the energy.
Joe

I've replaced them many times. Take flush rivets and "set them" with a shorter stem to fill the opposite countersink hole the best you can. It helps to use a larger rivet gun as mentioned earlier.