Central function has the locking lever. Solving it, all legs are loose. One should then have secured his camera, either not fixed on a tripod or with one hand. Did they then found the new location, satisfies the tightening of the locking lever and everything is fixed stable again. Bolt and locking lever are thus charged accordingly.
On the website of UNI-LOC states: The powerful lever clamps the toothed wheels with a handle for maximum stability.
I bought it in June 2011 for less than 400 (not Amazon). Although I have not often used the tripod in the 2.5 years and kept my applied force within limits, the thread of the locking lever of the load has not withstood. The thread broke (s. Photo). A powerful lever that is not so. A substitute (the guarantee was precisely expired) cost 49 excl. Shipping.
See from the teeth and I feel nothing. Also at the basis of the level lever legs can still move. But the weight of the camera is not sufficient.
In addition, the link between central joint and tripod legs in two of three legs game has so wobbles.
Now one can argue how many points / star should be awarded. Actually, I'd give it 5 stars, but by the mentioned shortcomings, I can no longer awarded as a. This must not happen.