Due to our experience the use of a torque wrench will bring no advantage for two reasons:
1. The requested torque for centring the locknut is quite low, so that the inaccuracy of reading and the range of variation will lead to negative conditions.
2. As the friction conditions are different at every screw, the pretensioning force will be different even if all screws are tightened with the same torque. The locknut will start to stagger. The right way for centring is to tighten all screws evenly with the same angle independent of the torque. The feeling of a qualified worker will be sufficient.