How do I access the washers on this bath tap please

[Sunshinesdad]

Advice appreciated. See photo.
I cannot find any way to access the washers. Thee covers do not seem to be removable. There are no screws t be seen.
D

 

[galaxy_plumbing]

cant see any screw or cover from pic so knobs are probably just pushed on. it may take bit of force and persuading as probably they are limescaled. good luck.

 

[Harvest Fields]

As above get a good grip on the knobs and gently work them forward

 

[Sunshinesdad]

Thanks guys!!!! It pulled off with difficulty, but I had been scared to try before I got your advice. In fact, inside is an Ideal Standard 963400NU headwork ( cartridge ) - see pic.
I think the drip problem is associated with the ring washer highlighted.
It seems to be 20mm diameter.
Does anyone know the exact spec?
Your help has been greatly appreciated§
D

 

[townfanjon]

I doubt if it is that O ring pal , but if it is , those are easy to source.
Ring ideal I have always found them very helpfull .

 

[Sunshinesdad]

Thanks again guys - I fixed the drip - possibly will re-occur, but fine for now!

Not having new O-ring I cleaned the scale from the thread near the O-ring, then used a small screwdriver to raise the O-ring around its circumference, to make it more proud, then ran some vaseline around the ring - replaced the unit - and the drip has stopped.

Without advice from you, I couldn't have done it!

 

[Stigster]

Thanks again guys - I fixed the drip - possibly will re-occur, but fine for now!

Not having new O-ring I cleaned the scale from the thread near the O-ring, then used a small screwdriver to raise the O-ring around its circumference, to make it more proud, then ran some vaseline around the ring - replaced the unit - and the drip has stopped.

Without advice from you, I couldn't have done it!

Well done. At least if it fails again you now know you can change it for a new cartridge if necessary, now you have the knowledge.

 

[Best]

The bottom seal washer - (a sort of soft white rubber washer) is what often deteriorates with those works. If the compression then is lessened against the ceramic works, the tap will drip. I have replaced that washer as a temporary fix, but not worth the bother