Hi Folks, Need your advice on how to access a thermostat cartridge to fix/replace. Please see pics below. I have manged to to get the main shower control cartridge out as it is leaking badly. But now need to sort the thermostat/mixer out now as very stiff and difficult to turn to cold. The problem is I can't work out how to get the chrome surround off, which I am assuming I need to do to access it. It is the bottom one in third picture. Could anyone please advise?
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