I was setting up my new NN5 on my old Bogen 3205 and noticed the center column moving slightly as I rotated the camera.
At first I thought something was loose.
Then I noticed the gap between the legs and the underside of the base caused by the O-ring.
I removed it and the base now sits firmly on the legs.
Not sure if other tripods have this, but if they do, see if it removing it doesn't make it more sturdy.
Thanks for sharing that. A setup is only as good as the weakest link in the system and many tripods fail - especially lower end models and tripods that have been taken to the moon and back - no wait - they left the tripods there