New kitchen tap - faulty?

[Kilt]

Had to replace our kitchen tap as old one was spurting water vertically, as you turned the curved mixer section. 
 

Due to lockdown 3, I had to order online. 
The new tap plumbed in easy enough, but the new mono, mixer arm wobbles terribly.

It’s not the sink, that’s solid, as is base of tap, it’s just the movable arm. 
it’s almost like it needs a screw/bolt tightened up somewhere internally but there are none visible. 
 

faulty or just Chinese tat? It was still £70 tap from Screwfix (Cooke & Lewis Mono Mixer) so easy to get refunded, just wondered if anyone knew of a fix or issue?