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how can i fix my drayton TRV?

i have a drayton trv that i think has the pin stuck,the knurled nut has a tiny grub screw presumably to release the nut so that the top can be unscrewed and removed for servicing the problem is i cant unscrew it with alan keys is there some other tool that i need please
ray saunders, December 2010
link Click here to see other fixes for Drayton.