I needed a good clamp 90 for assembly. I read all the reviews and chose this one even though it was expensive. I thought it was worth the money for the time and accuracy saved. I was wrong. Straight out of the box, the threaded rod that ends at the turntable was difficult to turn. Either the threaded shaft wasn't round or the bearing didn't have a hole. The point wasn't that it was necessary to "sand". One of them wasn't round. With this problem, it is difficult to use the clamp. Secondly, most