Valve stiff to turn on

I have an old version of the Java Thermostatic mixer with rising head. The valve has become very hard to turn on despite visits from the plumber. He has added lubricant but this has not worked so suspect we need to get the cartridge replaced. I have copied the component diagram that I have. Any help would be much appreciated.
Asked 9 years ago by Anonymous

www.showerdoc.com/bristan-thermostatic-cartridge-cart-5

This is the cartridge in your shower.

Answered 9 years ago by Anonymous

Do you need any additional help to find the correct spare part?

Please click the following link if you would like to see other answers or ask a question regarding the Bristan Java Thermostatic Recessed Shower & Fixed Head - Chrome - Shower Spares

If you've landed here and this question is not about your specific product, please take a look at these similar items on our Bristan Concealed Shower Valves Spares page. Alternatively, if you're looking for any other brands you should view our full range of Shower Spares.

If you do not want to proceed with a repair or you want to buy this item or similar, please consider one of our Replacement Bristan Concealed Shower Valves

For any other support request please get in touch.