It seems that the spindle needs to have a cup/cone type bearing at the spindle end and another bearing(s) that can slide as the nut on top is tightened up to remove any play. I rebuilt a r-8 spindle the other day. That was the arrangement of the bearings. My Haas service tech is coming next week to install my VF-5/50. I will ask him about the arrangement on the Haas VMC spindle. Maybe he can shed some confus... I mean light on the subject.

By the way, what do you use to produce those drawings? They look great.