The two aft braces and the spacers were clecoed to the firewall flange. I drilled thru the flange and the spacers and braces in four places in each brace. I also drilled the spacers only to the braces. The spacers will be riveted to the braces and then the braces will be riveted to the firewall flange. This should make it easier to keep everything in place when the top skin is riveted to the firewall. I dimpled the firewall flange, the top skin, and the spacers with the pneumatic squeezer. The two aft braces were countersunk.
