I fabricated the F-601TD brake reinforcement doubler and match drilled it to the fuselage. I also laid out and drilled the 7/16″ holes through this and the firewall. Drilling stainless is pretty hard on cutting tools, but I used some foam that is a tapping lubricant and that seemed to work really well.
Here are all of the components that came off of the firewall. I deburred all of these except for the steel brackets at the top. There’s still a lot of work to do here as the firewall side of most of these pieces needs to be machine countersunk to receive the dimples in the firewall.
The plans don’t make any mention of it, but the F-601Z aux fuel firewall doubler isn’t required if you’re using a fuel injected engine as I will be. Leaving this out means a lot fewer unnecessary holes in the firewall.
