Raised the question of how you centralise such turrets with "one who knows about such things" many years ago and was told that a setting spacer to define the cross slide position was considered good practice. How the spacer was used and whether its practical on a Myford I have long forgotten.
I imagine I was asking about possibly using one on a SouthBend 9" but the idea went no further.
If possible its better to arrange things so that the turret can be set up without removing a job from the chuck. Although turrets are normally associated with end on working there is no reason why you can't use normal style boring and similar tools in the turret by traversing the cross slide in the usual way to apply cuts.
Clive