No, its not the hands, its the actual mechanism insides.
There are two levers that sit on brass wheels of one cog. As the linkage turns ut falls into a slot and stops the chime. The other operates the other butterfly part.
Each are fixed by a screw, but were bith loose, so need to line them up correctly. Quite hard to explain in text.
Cannot find any info that shows this exploded view or actual point it should be at.
Dave, December 2014