On Wed, 07 Apr 2021 14:02:40 -0400, Clare Snyder posted for all of us to
digest...

Generally they are "crimped" on and sealed with sealant. Sometimes
"pop" rivetted as well. That's what "I" would do, being I have a LOT
of small rivets left over from various projects - mostly "plane shaped
objects" built by friends.


B-17 ?

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Tekkie