Hi, Please see image. I have a bathroom radiator that I am struggling to work out how the TRV knob comes off so I can put a timer knob one on. The front of the silver knob comes off and there seems to be a screw thread inside. I have done other radiators in the house but this one is different to those. On the others I haven't had to take the T part of - I just unscrew the knob thread underneath and then pop the new timer back in place. Thanks for any assistance, Stu
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