I don't know if I received a defective piece, but the link in the middle (between the 2 arms) was so stiff that it required excessive force to rotate, resulting in the loss of flexibility advantage - movement combinations due to the presence of two arms (it would work like a single long arm). I didn't want to experiment (with oils, grease, WD40, etc.) for fear that if they didn't have a good result, I wouldn't be able to return it. I immediately returned it without installing it and didn't risk making a change with the same product. Since the TV for which it was intended was small in size, I eventually got the Brateck KLA26-112, which I am completely satisfied with.