Hi . why not just replace the whole valve ?its a lot easier.
But can I just check that are trying to replace the inner gland and not just the thermostatic head
http://www.gaspares.co.uk/product/07+35+009. This site sells the gland kits .if happy with your answer , can you please rate it thanks . but if you need more info , please continue.
Hi , checked with drayton .the gland comes with a tool you will need
Hi . could you please rate my answer if happy with it , thanks