Help with Rio Mixer Shower Head Removal

[Croftuz]

Im trying to service the Cartridge on my Bristan Rio Mixer, and I’m stuck! The instructions from Bristan don’t make sense when compared to the unit.

I’ve taken off the tap head part from the thermostat control. I can’t find any grub screw under any where to expose the Cartridge. Might it be that it’s pushed
On to the
Head part of the cartridge and has just stuck with lime?

I can provide pics if necessary but can’t work out how to upload them!

Please help!

 

[AMGasServices]

I think it will better if you could upload the images also the instructions too.