I have a Shires thermostatic shower. I need to remove the thermostatic cartridge for descalling or perhaps replacement.
I have removed trim, isolated water supply and removed the plastic temperature limit disc.
So far so good.
However, when I try to unscrew the cartridge I seem to be removing the centre of the cartridge rather than the whole cartridge itself. I can't figure out how to get the whole cartridge out as a whole piece. There isn't a grub screw in this unit...
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