I was just watching the API 610 webinar and noticed that in Richard Ay's model, the suction and discharge nozzle restraints appear to have Anchors with Cnodes connected to rigid elements.

What is the CNode for the anchor restraint? Or are the rigid elements not directly connected to the anchor element?

Is there any difference/benefit between using this method vs directly applying displacements to the nozzle location as shown in Tutorial B?