Shoudn't we always begin to balance the gimble on the roll without the roll belt and without the camera ? And eventually tune later with the cam because the lens will have to be centered on the roll axe. The only problem to do that is that you realise that there is a lot of weight on the left with the servo and that you will have to slide a lot to the right making the gimble look asymetrical ... Thanks Denis
No reason to balance without the camera. It would be great to have the center of the camera lens centered with the shaft of the roll pulley but in reality it doesn't seem to be that critical. And you are absolutely correct that once the camera is on you will be shifting left and right to get it balanced.
I tested how much weight had to be added on the right side of the gimbal to balance it without camera, then I just bought à 3s lipo of that weight wich I put on the right side boom of the gimbal ( the lipo powers servos and Radians)