It's very easy to mark either the top or bottom skin when double flush riveting the trailing edge. I've put a strip of painter's tape where the skin has a small crease about 12mm from the trailing edge - this is to protect the skin as the the diameter of the back-riveter comes very close to that bend.
This shows how I've propped the front of the elevator with some sheets of Perspex to ensure the bottom of the trailing edge is flush on the back plate.
This is a close-up showing where I put the tape in an attempt to limit marks on the skin caused by the back-riveting gun.
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