the spindle head was nowhere to be seen. Found it stuck in the recess of the head! Snapped clean off. So when i thought it was turn it was in fact doing b*****r all!
!
Now we know why it was turning 360° !!!
I now note that some of my previous posts here did not totally correctly asimilate the situation.
But at least we all know that he not only broke the old head but the old valve as well!