spc type 9gearbox annoyingly keeps jumping out of third gear only, mostly on down change, otherwise great gearbox, spoke to Steve and he suggested stretching the detent spring in the top left hand side case, behind 10 mm Allen grub screw. This has improved the problem slightly, I stretched around 3-4 mm as it was quite difficult. Anyone else had similar problem or can anyone explain how this all works. Will speak to Steve again for suggestions. Any info please.