That small square stub is the end of the speedometer cable.  There is a
retainer that must be removed then the grease cup will slide off over
the cable end.

Mike

Jens Jakob Andersen wrote:
> Hi
>
> How do I remove the hubcapon the driverside (the one protecting the
> hub nut on the steering knukle /spindle)
>
> IT feels like it is springloaded, and there is a small square stub
> protruding from the middle of the hubcab.
>
> No idea here.
>
> /JJ
>