This holder has two "balls" one inside the other one. The ball inside moves only up-down. If it would be allowed to rotate in both directions, then the situation would perhaps be better, but then perhaps two screws would be required to lock the position of the head. So perhaps I was too harsh and this was a valid design choice.
Anyway it seems that with extra paper slip one can make it resist rotation to the point that the rubber attaching it to the table is about to give up.
The resistance to rotation also depends on lubrication and a brand new product definitely is significantly lubricated. I expect that lubrication will wear down quickly and the rotation resistance will improve.
I agree this is not a heavy duty equipment, but when equipped with PCB holder, the radius of the head attached to that is rather large (say 15-18 cm) which made rotating really easy.
So I am not returning. I love the PCB holder in that comes with product, and teflon pads for the standard vise
Somehow I have feeling that my copy was overlubricated, now the resistance is larger...