Help replacing gear linkage cables Mk4 Seat Ibiza

[annettsnm]

Hi all,

I’m currently in the process of replacing gear linkage cables as one snapped on me (although still attached to the gear box)

I bought a complete new gear-lever, gate, and cables all attached so I can simply unbolt the old and put in the new. However I’m having trouble getting the old cables off of the ball joint attaching them, is this a lock nut or something? Am I missing something stupid? I’ve attached some pictures of the cables still attached, and the new cables for reference.



Any help is greatly appreciated, very stuck!
Cheers