Replacing 0 rings on a sirrus ts1850 shower

[yaleguy3]

Hi I have the O ring kit for my leaky ts1850 antique shower.

The kit came without instructions and I cannot find anything on the web.

I have removed the arm from the water valve tap and taken off the end cap , removed the internal screw and c clip from the temperature valve and removed the bottom grub screw from the water on/off valve .
That seems to be as far as I can get from the front and still there is lots to do to get to the orings.
I am now thinking that perhaps I need to take the unit from the wall to get into the orings from the back?
Is this correct?
I seem to have hit a dead end..!!

 

[Morris40]

I've just checked and ( the shower doctor ) website has your shower details in exploded form, try there[/img]

 

[yaleguy3]

It does thanks and I have already looked there but the image is so poor quality I cannot decipher the parts or even recognise them compared to what I have.