These two brackets are going to be used to hold the ends of the Bowden cables for the two heat controls. In a past life, they were z-brackets for the fuel tanks.

After fabricating the brackets, I decided to finally get around to removing the bottom nutplates off the center spar cover brackets.

I used the drilling jig I had made previously to drill the new second rivet hole for a miniature single lug nutplate.

After slotting the screw hole and countersinking for the extra rivet, I got these nutplates riveted in. This was a major pain in the back (literally) since it's really cramped working in the forward part of the plane. I think I pulled a muscle in my back. Gah.

Next was to drill the hole for the second Bowden cable. I used a drilling jig to get ensure the hole was centered on the vertical stiffener.

...then opened the hole up to #11.

In order to correctly locate the Bowden cable brackets, I used some 3/16 steel rod to position them before drilling them to the firewall.

A bit of deburring, dimpling, and riveting later, they were attached. Looks good!

Not bad from the front side either.