mixer tap bit sticky

[HawkEye244]

Hi all,
I was hoping it were possible to clean inside the mixer head and see it it makes the swivel function of the tap any easier.
Firstly, is this possible?
Secondly, how do I remove the cap of the tap then?
In the photo I have removed the level and a small cap underneath it but it does not appear to have a Philips or pozi connection inside it. I can't take a photo of something so small otherwise I would try.
Thanks for any help

 

[terryplumb]

Probably a grub screw needing a hexagonal wrench ( Allen key) to undo.

 

[HawkEye244]

Thanks, opened it up and realised there's basically nothing to clean

 

[Madrab]

There's a ceramic cartridge in there, can't be serviced, nothing you can do to make it turn easier apart from replacing the cartridge