Prepped Firewall for Riveting

My mom's in town, so I got her help dimpling the firewall.  I was a little worried that the DRDT-2 dimpler wouldn't make as crisp of a dimple in the stainless (though I didn't even try to see if this fear was warranted).  My buddy Andre has a couple of the traditional Avery style dimplers, so I borrowed one to dimple the firewall.



As you can see, the dimples are perfectly crisp and the material around the dimple is perfectly flat.



I also machine countersunk about half of the holes in the stiffeners before having to call it a day.  Hopefully I can finish these up, prime them and rivet the firewall together in the next couple of days.