For clarity, I show the rear side of the positioning system here. The optical mount positioned on the y linear motor. The mass of the optical mount is less than 500g and the centre-of-mass is about 20mm away from the motor.
This is the concept we consider to position the diamond in the vacuum chamber. Two piezo motors position the sample in x and y (Right-Left and Up-Down). For the angle, actuators on the 1'' optical mounts are used.