GRAAL big pieces 20 Years AO@ESO7 Hawk-I shutter Alu- structure Steel structure bearing Torque drive Steel flange LGS trombone LGS WFS assembly NGS-TT sensor assembly MCM assembly Bearing (150Nm friction / 80kg) Torque drive (500Nm nominal / 70kg) Encoder (tape / scanning head) Cable-guide system (110 kg) Aluminium structure (75 kg) Steel structure (50 kg) Counterweight