Twice unlucky or underground quality?

The assembly is very easy of equip, here is highly recommended that you use at the junctions of the cylinder silicone spray or similar. You will probably need to disassemble the chair namely and return again, because ....
At the first sitting at your desk, I realized that I still very funny slopes to the left. Small rotation by 180 degrees. Aha, now I hang to the right. As it turned out, the receiving tube in the foot was wrapped wrong. Therefore the thing wobbles like a cow's tail.
Ok, can happen to anyone. Amazon informed. Replacement product received within one day.
But this time I failed already in the assembly. No matter how you put the cylinder in the intake pipe at the base, he wiggles back and forth, as well the receiving tube is not round enough. Sitting is not so.

Both chairs have incidentally already signs of use. You could see, for example, that you ever screw (paint away) were secured in the chair bottom. In my opinion, is defective returns that are to be sold here in uncritical / return lazy customers.
Therefore: Never again TOPSTAR. That Amazon will ship this crap does also not good.