Originally Posted by dlomheim
I spent 15 months renovating a 3A and the plans called for metal straps that the pins clamp onto, to be heat treated so I grabbed one of the four and took it to a local engineering business to have it "Rockwell" tested. If I remember right it came back with a result (70,000 psi?) that definitely showed it had been heat treated, so I made the assumption that the original builder had also done that to the other three pieces. I enjoyed the process of getting it flying again after it sat for 12 yrs., but the real kick was actually flying it!
RV-9A Mazda 13B/FWF
I cannot think of where mine came from, too many years back, but they were heat treated and noted as so. Think they were aftermarket back then there were several selling different parts for the 3 such as stick assemblies rudder pedals and other items.