Are you sure that's corrosion Tim? It looks a lot like what I generally see on lower rudder rod end bearings as an accumulation of belly oil and dirt. On almost every RV tail dragger, you're going to get dirt accumulating on whatever oil/lubrication is there.
Just asking because I have never seen corrosion on those things - even when I lived in a salt air environment - but I have seen lots of grime....
Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)