Centrifugal Compressor - Shaft`s Axial Displacement Sensors setting on zero position(Thrust Bearings)

I know that there are two consecrated variants namely by (1)running the machine thus the rotor is pushed into its standard operating position, indicated as zero position or (2)by placing the rotor in the middle of thrust bearing clearance(total float), indicated as zero position as well.

My question refers to the latest(second) version of zero position setting when using the dial gauge to measure shaft`s total float(between thrust bearings), is it absolutely necessary to apply a certain thrust(simulating real operation condition) or it is just enough to push the rotor , back & forth, until the thrust collar touches the Thrust Bearing (Active & Non-Active) pads ?

Thank you advise,

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