Dripy kitchen tap

[Lrbuild]

A customer had a leaky tap I struggled to find an o ring to fix it so replaced the cartridge, 3 months later the drip is back

The tap was about 200 quid not off eBay

Any thoughts on a fix

 

[GReynolds929]

Got a model and pics. Not enough info in your post to recommend anything other than replacement.

 

[RickFlorida]

I'm super curious to see what plumbing fixtures in the UK look like. Please show us. I assume you can get the good German stuff?