Forgot about the spring which hold the ball bearing in place, it is a long time since I had one apart although I still have a 996.Absolutely correct, I think there is a spring there too. Do NOT lose that ball, it is matched to the valve. The hole in the valve is very fine!
Ha ha, must benear 40 years since I did one on a 996 then dropped the ball into the nerher world of the gearboxForgot about the spring which hold the ball bearing in place, it is a long time since I had one apart although I still have a 996.