Section 27 Firewall … Page 27-2, Steps 7 After work today I riveted all the parts to the firewall with the factory side of the rivets toward the engine exit for two nut-plates. Time about 3 hours because it was hot. I also ordered a set of stainless steel brake lines and a spring hinge and cam-lock for the begin oil checking door i.e. Cessna 182. For 255.00 us dollars from a company named Nonstop Aviation that specializes in RV-10 parts in NE Alabama.