All those rivets remind me of the aftermarket air filter I put on my 1964 Mini Cooper.
The air filter was held together with a screw on the inside of filter, the nut on the outside.
Driving to Griffith from Melbourne, just outside Jerilderri at night, it starts running on 3.
4 hours later, under the lights of the 24 hour Caltex servo, I finally got the head back on after taking it off to remove said screw from an inlet valve seat.