I just rebuild my gearbox.
It work correctly till i connected the adjusting arm to the gear selector...especialy in 4th gear it was very bad..after good looking why i discovered lots of wear in the clevis pins and forks...i re-drilled the arm , gear selector and both forks to a 0.5 mm oversize and made 2 new pins...result ...no wear between the arm and the gear selector anymore wich result in perfect shifting now.