Rickety thread with a lot of game

I was very disappointed with the fit of the threaded screw and locknuts. I can not imagine that a lateral difference of 4 mm loose lock nuts is normal to each other when they are easily squeezes his fingers me. See also the attached image, where only a poor adhesive scotch tape shrinks the Nuts. Counters are the nuts against each other, the whole is stable. I just want a Somikon - holder for smartphones screw, but it might just be enough. More last hold inaccurate manufactured parts determined not.

Conclusion: everything was very rickety, for my project just about acceptable. Therefore 2 stars.