How to remove TRV?

Joined
9 Jan 2005
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United Kingdom
I have one TRV that is easily removed, so I can get to the pin to check it's free. However, all the others won't come off easily (British Gas ones and also Caleffri) and I'm afraid to use brute force unless i know that's what I should do. Can someone tell me how to get them off please?
Thanks
 
Dont know the bg ones, but some have a little allen screw, some have a normal screw and some have a nut that unscrews.

And some have a collet that turns
.
 

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