It appsears I have somehow managed to improperly mate it. Now it is tight, if you rotate it it feels like there is some kind of antirotation element with a bit of slack (a few degrees) in either direction.
Annoying, since this is my directivity bridge, I guess I need to check the junction with another bridge just incase. The other one does not have that antirotation feel to it, its just super tight (finger tight).
I believe the term is 'play'.
I'm not sure what axis its rotating about, but the 'seal' looks good. Both joints do this to an extent, one does it a bit more.
Pennies on the dollar, so I should count my blessing I suppose.