The front suspension of the Z is what Nissan calls Aluminum Multi-Link. The top of the spindle is connected to the chassis via an aluminum wish-bone. The bottom of the spindle is connected to the chassis through two independent links - not a one-piece wishbone.

Pictures of front suspension joints, click for full size pic (WARNING they are large). All pictures are of drivers side front.
This picture shows the bottom links and illustrates the castor.
This also shows the ball mount for the bottom front link to the spindle and strut mount.	This shows the top wishbone ball joint.	This shows the sway bar link to the bottom front link..	This shows the ball mount for the bottom rear link to the spindle.
This shows the ball mount for the bottom front link to the chassis.	This shows the ball mount for the bottom front link to the spindle and strut mount.	This shows the tie-rod ball mount to the spindle.	From the front looking back illustrates camber.
This shows the rubber ball mount for the bottom rear link to the chassis.

All joints except for one appear to be steel joints, most with rubber dust covers. The ball joint for the bottom rear link to the chassis is rubber mounted. This joint is not metal to metal with a dust cover. This is the likely candidate for the feathering problem.