Hi great vid cheers.. my box in 3rd gear isn’t level across ? The arm sticks up above gasket face about 0.8mil . My gearbox on a new engine build is clunking when the hub is turning and trying to jump out of gear.. I was wondering if I have the wrong box for this 1983 125 engine. When the selector box is removed the knocking stops when hub is turned and all goes through the gears properly . Any suggestions or help be brilliant, thanks Paul .