My Kitfox IV has a slightly tweaked gear on the pilot side when I bought it. It has flown OK but I figured I would get it resprung this winter to save any further damage to it. I contacted Grove, they had me check the serial number. My last two numbers were 24 which they said indicated it is and older gear using 2024 aluminum (new ones use 7074). They said that they don't respring the 2024 gears because it is cheaper to buy an new one. Cost would be $900+ to reheat treat. I don't understand their math, to me $900 is cheaper than $1650, but they weren't interested in doing it. Think I will look at the new taller rough country gear.